| 1 | """
|
| 2 | word_eval.py - Evaluator for the word language.
|
| 3 | """
|
| 4 |
|
| 5 | from _devbuild.gen.id_kind_asdl import Id, Kind, Kind_str
|
| 6 | from _devbuild.gen.syntax_asdl import (
|
| 7 | Token,
|
| 8 | SimpleVarSub,
|
| 9 | loc,
|
| 10 | loc_t,
|
| 11 | BracedVarSub,
|
| 12 | CommandSub,
|
| 13 | bracket_op,
|
| 14 | bracket_op_e,
|
| 15 | suffix_op,
|
| 16 | suffix_op_e,
|
| 17 | ShArrayLiteral,
|
| 18 | SingleQuoted,
|
| 19 | DoubleQuoted,
|
| 20 | word_e,
|
| 21 | word_t,
|
| 22 | CompoundWord,
|
| 23 | rhs_word,
|
| 24 | rhs_word_e,
|
| 25 | rhs_word_t,
|
| 26 | word_part,
|
| 27 | word_part_e,
|
| 28 | )
|
| 29 | from _devbuild.gen.runtime_asdl import (
|
| 30 | part_value,
|
| 31 | part_value_e,
|
| 32 | part_value_t,
|
| 33 | cmd_value,
|
| 34 | cmd_value_e,
|
| 35 | cmd_value_t,
|
| 36 | AssignArg,
|
| 37 | a_index,
|
| 38 | a_index_e,
|
| 39 | VTestPlace,
|
| 40 | VarSubState,
|
| 41 | Piece,
|
| 42 | )
|
| 43 | from _devbuild.gen.option_asdl import option_i, builtin_i
|
| 44 | from _devbuild.gen.value_asdl import (
|
| 45 | value,
|
| 46 | value_e,
|
| 47 | value_t,
|
| 48 | sh_lvalue,
|
| 49 | sh_lvalue_t,
|
| 50 | )
|
| 51 | from core import error
|
| 52 | from core import pyos
|
| 53 | from core import pyutil
|
| 54 | from core import state
|
| 55 | from display import ui
|
| 56 | from core import util
|
| 57 | from data_lang import j8
|
| 58 | from data_lang import j8_lite
|
| 59 | from core.error import e_die
|
| 60 | from frontend import consts
|
| 61 | from frontend import lexer
|
| 62 | from frontend import location
|
| 63 | from mycpp import mops
|
| 64 | from mycpp.mylib import log, tagswitch, NewDict
|
| 65 | from osh import braces
|
| 66 | from osh import glob_
|
| 67 | from osh import string_ops
|
| 68 | from osh import word_
|
| 69 | from ysh import expr_eval
|
| 70 | from ysh import val_ops
|
| 71 |
|
| 72 | from typing import Optional, Tuple, List, Dict, cast, TYPE_CHECKING
|
| 73 |
|
| 74 | if TYPE_CHECKING:
|
| 75 | from _devbuild.gen.syntax_asdl import word_part_t
|
| 76 | from _devbuild.gen.option_asdl import builtin_t
|
| 77 | from core import optview
|
| 78 | from core.state import Mem
|
| 79 | from core.vm import _Executor
|
| 80 | from osh.split import SplitContext
|
| 81 | from osh import prompt
|
| 82 | from osh import sh_expr_eval
|
| 83 |
|
| 84 | # Flags for _EvalWordToParts and _EvalWordPart (not all are used for both)
|
| 85 | QUOTED = 1 << 0
|
| 86 | IS_SUBST = 1 << 1
|
| 87 |
|
| 88 | EXTGLOB_FILES = 1 << 2 # allow @(cc) from file system?
|
| 89 | EXTGLOB_MATCH = 1 << 3 # allow @(cc) in pattern matching?
|
| 90 | EXTGLOB_NESTED = 1 << 4 # for @(one|!(two|three))
|
| 91 |
|
| 92 | # For EvalWordToString
|
| 93 | QUOTE_FNMATCH = 1 << 5
|
| 94 | QUOTE_ERE = 1 << 6
|
| 95 |
|
| 96 | # For compatibility, ${BASH_SOURCE} and ${BASH_SOURCE[@]} are both valid.
|
| 97 | # Ditto for ${FUNCNAME} and ${BASH_LINENO}.
|
| 98 | _STRING_AND_ARRAY = ['BASH_SOURCE', 'FUNCNAME', 'BASH_LINENO']
|
| 99 |
|
| 100 |
|
| 101 | def ShouldArrayDecay(var_name, exec_opts, is_plain_var_sub=True):
|
| 102 | # type: (str, optview.Exec, bool) -> bool
|
| 103 | """Return whether we should allow ${a} to mean ${a[0]}."""
|
| 104 | return (not exec_opts.strict_array() or
|
| 105 | is_plain_var_sub and var_name in _STRING_AND_ARRAY)
|
| 106 |
|
| 107 |
|
| 108 | def DecayArray(val):
|
| 109 | # type: (value_t) -> value_t
|
| 110 | """Resolve ${array} to ${array[0]}."""
|
| 111 | if val.tag() == value_e.BashArray:
|
| 112 | array_val = cast(value.BashArray, val)
|
| 113 | s = array_val.strs[0] if len(array_val.strs) else None
|
| 114 | elif val.tag() == value_e.BashAssoc:
|
| 115 | assoc_val = cast(value.BashAssoc, val)
|
| 116 | s = assoc_val.d['0'] if '0' in assoc_val.d else None
|
| 117 | else:
|
| 118 | raise AssertionError(val.tag())
|
| 119 |
|
| 120 | if s is None:
|
| 121 | return value.Undef
|
| 122 | else:
|
| 123 | return value.Str(s)
|
| 124 |
|
| 125 |
|
| 126 | def GetArrayItem(strs, index):
|
| 127 | # type: (List[str], int) -> Optional[str]
|
| 128 |
|
| 129 | n = len(strs)
|
| 130 | if index < 0:
|
| 131 | index += n
|
| 132 |
|
| 133 | if 0 <= index and index < n:
|
| 134 | # TODO: strs->index() has a redundant check for (i < 0)
|
| 135 | s = strs[index]
|
| 136 | # note: s could be None because representation is sparse
|
| 137 | else:
|
| 138 | s = None
|
| 139 | return s
|
| 140 |
|
| 141 |
|
| 142 | def _DetectMetaBuiltinStr(s):
|
| 143 | # type: (str) -> bool
|
| 144 | """
|
| 145 | We need to detect all of these cases:
|
| 146 |
|
| 147 | builtin local
|
| 148 | command local
|
| 149 | builtin builtin local
|
| 150 | builtin command local
|
| 151 |
|
| 152 | Fundamentally, assignment builtins have different WORD EVALUATION RULES
|
| 153 | for a=$x (no word splitting), so it seems hard to do this in
|
| 154 | meta_oils.Builtin() or meta_oils.Command()
|
| 155 | """
|
| 156 | return (consts.LookupNormalBuiltin(s)
|
| 157 | in (builtin_i.builtin, builtin_i.command))
|
| 158 |
|
| 159 |
|
| 160 | def _DetectMetaBuiltin(val0):
|
| 161 | # type: (part_value_t) -> bool
|
| 162 | UP_val0 = val0
|
| 163 | if val0.tag() == part_value_e.String:
|
| 164 | val0 = cast(Piece, UP_val0)
|
| 165 | if not val0.quoted:
|
| 166 | return _DetectMetaBuiltinStr(val0.s)
|
| 167 | return False
|
| 168 |
|
| 169 |
|
| 170 | def _SplitAssignArg(arg, blame_word):
|
| 171 | # type: (str, CompoundWord) -> AssignArg
|
| 172 | """Dynamically parse argument to declare, export, etc.
|
| 173 |
|
| 174 | This is a fallback to the static parsing done below.
|
| 175 | """
|
| 176 | # Note: it would be better to cache regcomp(), but we don't have an API for
|
| 177 | # that, and it probably isn't a bottleneck now
|
| 178 | m = util.RegexSearch(consts.ASSIGN_ARG_RE, arg)
|
| 179 | if m is None:
|
| 180 | e_die("Assignment builtin expected NAME=value, got %r" % arg,
|
| 181 | blame_word)
|
| 182 |
|
| 183 | var_name = m[1]
|
| 184 | # m[2] is used for grouping; ERE doesn't have non-capturing groups
|
| 185 |
|
| 186 | op = m[3]
|
| 187 | assert op is not None, op
|
| 188 | if len(op): # declare NAME=
|
| 189 | val = value.Str(m[4]) # type: Optional[value_t]
|
| 190 | append = op[0] == '+'
|
| 191 | else: # declare NAME
|
| 192 | val = None # no operator
|
| 193 | append = False
|
| 194 |
|
| 195 | return AssignArg(var_name, val, append, blame_word)
|
| 196 |
|
| 197 |
|
| 198 | # NOTE: Could be done with util.BackslashEscape like glob_.GlobEscape().
|
| 199 | def _BackslashEscape(s):
|
| 200 | # type: (str) -> str
|
| 201 | """Double up backslashes.
|
| 202 |
|
| 203 | Useful for strings about to be globbed and strings about to be IFS
|
| 204 | escaped.
|
| 205 | """
|
| 206 | return s.replace('\\', '\\\\')
|
| 207 |
|
| 208 |
|
| 209 | def _ValueToPartValue(val, quoted, part_loc):
|
| 210 | # type: (value_t, bool, word_part_t) -> part_value_t
|
| 211 | """Helper for VarSub evaluation.
|
| 212 |
|
| 213 | Called by _EvalBracedVarSub and _EvalWordPart for SimpleVarSub.
|
| 214 | """
|
| 215 | UP_val = val
|
| 216 |
|
| 217 | with tagswitch(val) as case:
|
| 218 | if case(value_e.Undef):
|
| 219 | # This happens in the case of ${undef+foo}. We skipped _EmptyStrOrError,
|
| 220 | # but we have to append to the empty string.
|
| 221 | return Piece('', quoted, not quoted)
|
| 222 |
|
| 223 | elif case(value_e.Str):
|
| 224 | val = cast(value.Str, UP_val)
|
| 225 | return Piece(val.s, quoted, not quoted)
|
| 226 |
|
| 227 | elif case(value_e.BashArray):
|
| 228 | val = cast(value.BashArray, UP_val)
|
| 229 | return part_value.Array(val.strs)
|
| 230 |
|
| 231 | elif case(value_e.BashAssoc):
|
| 232 | val = cast(value.BashAssoc, UP_val)
|
| 233 | # bash behavior: splice values!
|
| 234 | return part_value.Array(val.d.values())
|
| 235 |
|
| 236 | # Cases added for YSH
|
| 237 | # value_e.List is also here - we use val_ops.Stringify()s err message
|
| 238 | elif case(value_e.Null, value_e.Bool, value_e.Int, value_e.Float,
|
| 239 | value_e.Eggex, value_e.List):
|
| 240 | s = val_ops.Stringify(val, loc.Missing, 'Word eval ')
|
| 241 | return Piece(s, quoted, not quoted)
|
| 242 |
|
| 243 | else:
|
| 244 | raise error.TypeErr(val, "Can't substitute into word",
|
| 245 | loc.WordPart(part_loc))
|
| 246 |
|
| 247 | raise AssertionError('for -Wreturn-type in C++')
|
| 248 |
|
| 249 |
|
| 250 | def _MakeWordFrames(part_vals):
|
| 251 | # type: (List[part_value_t]) -> List[List[Piece]]
|
| 252 | """A word evaluates to a flat list of part_value (String or Array). frame
|
| 253 | is a portion that results in zero or more args. It can never be joined.
|
| 254 | This idea exists because of arrays like "$@" and "${a[@]}".
|
| 255 |
|
| 256 | Example:
|
| 257 |
|
| 258 | a=(1 '2 3' 4)
|
| 259 | x=x
|
| 260 | y=y
|
| 261 |
|
| 262 | # This word
|
| 263 | $x"${a[@]}"$y
|
| 264 |
|
| 265 | # Results in Three frames:
|
| 266 | [ ('x', False, True), ('1', True, False) ]
|
| 267 | [ ('2 3', True, False) ]
|
| 268 | [ ('4', True, False), ('y', False, True) ]
|
| 269 |
|
| 270 | Note: A frame is a 3-tuple that's identical to Piece()? Maybe we
|
| 271 | should make that top level type.
|
| 272 |
|
| 273 | TODO:
|
| 274 | - Instead of List[List[Piece]], where List[Piece] is a Frame
|
| 275 | - Change this representation to
|
| 276 | Frames = (List[Piece] pieces, List[int] break_indices)
|
| 277 | # where break_indices are the end
|
| 278 |
|
| 279 | Consider a common case like "$x" or "${x}" - I think this a lot more
|
| 280 | efficient?
|
| 281 |
|
| 282 | And then change _EvalWordFrame(pieces: List[Piece], start: int, end: int)
|
| 283 | """
|
| 284 | current = [] # type: List[Piece]
|
| 285 | frames = [current]
|
| 286 |
|
| 287 | for p in part_vals:
|
| 288 | UP_p = p
|
| 289 |
|
| 290 | with tagswitch(p) as case:
|
| 291 | if case(part_value_e.String):
|
| 292 | p = cast(Piece, UP_p)
|
| 293 | current.append(p)
|
| 294 |
|
| 295 | elif case(part_value_e.Array):
|
| 296 | p = cast(part_value.Array, UP_p)
|
| 297 |
|
| 298 | is_first = True
|
| 299 | for s in p.strs:
|
| 300 | if s is None:
|
| 301 | continue # ignore undefined array entries
|
| 302 |
|
| 303 | # Arrays parts are always quoted; otherwise they would have decayed to
|
| 304 | # a string.
|
| 305 | piece = Piece(s, True, False)
|
| 306 | if is_first:
|
| 307 | current.append(piece)
|
| 308 | is_first = False
|
| 309 | else:
|
| 310 | current = [piece]
|
| 311 | frames.append(current) # singleton frame
|
| 312 |
|
| 313 | else:
|
| 314 | raise AssertionError()
|
| 315 |
|
| 316 | return frames
|
| 317 |
|
| 318 |
|
| 319 | # TODO: This could be _MakeWordFrames and then sep.join(). It's redundant.
|
| 320 | def _DecayPartValuesToString(part_vals, join_char):
|
| 321 | # type: (List[part_value_t], str) -> str
|
| 322 | # Decay ${a=x"$@"x} to string.
|
| 323 | out = [] # type: List[str]
|
| 324 | for p in part_vals:
|
| 325 | UP_p = p
|
| 326 | with tagswitch(p) as case:
|
| 327 | if case(part_value_e.String):
|
| 328 | p = cast(Piece, UP_p)
|
| 329 | out.append(p.s)
|
| 330 | elif case(part_value_e.Array):
|
| 331 | p = cast(part_value.Array, UP_p)
|
| 332 | # TODO: Eliminate double join for speed?
|
| 333 | tmp = [s for s in p.strs if s is not None]
|
| 334 | out.append(join_char.join(tmp))
|
| 335 | else:
|
| 336 | raise AssertionError()
|
| 337 | return ''.join(out)
|
| 338 |
|
| 339 |
|
| 340 | def _PerformSlice(
|
| 341 | val, # type: value_t
|
| 342 | begin, # type: int
|
| 343 | length, # type: int
|
| 344 | has_length, # type: bool
|
| 345 | part, # type: BracedVarSub
|
| 346 | arg0_val, # type: value.Str
|
| 347 | ):
|
| 348 | # type: (...) -> value_t
|
| 349 | UP_val = val
|
| 350 | with tagswitch(val) as case:
|
| 351 | if case(value_e.Str): # Slice UTF-8 characters in a string.
|
| 352 | val = cast(value.Str, UP_val)
|
| 353 | s = val.s
|
| 354 | n = len(s)
|
| 355 |
|
| 356 | if begin < 0: # Compute offset with unicode
|
| 357 | byte_begin = n
|
| 358 | num_iters = -begin
|
| 359 | for _ in xrange(num_iters):
|
| 360 | byte_begin = string_ops.PreviousUtf8Char(s, byte_begin)
|
| 361 | else:
|
| 362 | byte_begin = string_ops.AdvanceUtf8Chars(s, begin, 0)
|
| 363 |
|
| 364 | if has_length:
|
| 365 | if length < 0: # Compute offset with unicode
|
| 366 | # Confusing: this is a POSITION
|
| 367 | byte_end = n
|
| 368 | num_iters = -length
|
| 369 | for _ in xrange(num_iters):
|
| 370 | byte_end = string_ops.PreviousUtf8Char(s, byte_end)
|
| 371 | else:
|
| 372 | byte_end = string_ops.AdvanceUtf8Chars(
|
| 373 | s, length, byte_begin)
|
| 374 | else:
|
| 375 | byte_end = len(s)
|
| 376 |
|
| 377 | substr = s[byte_begin:byte_end]
|
| 378 | result = value.Str(substr) # type: value_t
|
| 379 |
|
| 380 | elif case(value_e.BashArray): # Slice array entries.
|
| 381 | val = cast(value.BashArray, UP_val)
|
| 382 | # NOTE: This error is ALWAYS fatal in bash. It's inconsistent with
|
| 383 | # strings.
|
| 384 | if has_length and length < 0:
|
| 385 | e_die("Array slice can't have negative length: %d" % length,
|
| 386 | loc.WordPart(part))
|
| 387 |
|
| 388 | # Quirk: "begin" for positional arguments ($@ and $*) counts $0.
|
| 389 | if arg0_val is not None:
|
| 390 | orig = [arg0_val.s]
|
| 391 | orig.extend(val.strs)
|
| 392 | else:
|
| 393 | orig = val.strs
|
| 394 |
|
| 395 | n = len(orig)
|
| 396 | if begin < 0:
|
| 397 | i = n + begin # ${@:-3} starts counts from the end
|
| 398 | else:
|
| 399 | i = begin
|
| 400 | strs = [] # type: List[str]
|
| 401 | count = 0
|
| 402 | while i < n:
|
| 403 | if has_length and count == length: # length could be 0
|
| 404 | break
|
| 405 | s = orig[i]
|
| 406 | if s is not None: # Unset elements don't count towards the length
|
| 407 | strs.append(s)
|
| 408 | count += 1
|
| 409 | i += 1
|
| 410 |
|
| 411 | result = value.BashArray(strs)
|
| 412 |
|
| 413 | elif case(value_e.BashAssoc):
|
| 414 | e_die("Can't slice associative arrays", loc.WordPart(part))
|
| 415 |
|
| 416 | else:
|
| 417 | raise error.TypeErr(val, 'Slice op expected Str or BashArray',
|
| 418 | loc.WordPart(part))
|
| 419 |
|
| 420 | return result
|
| 421 |
|
| 422 |
|
| 423 | class StringWordEvaluator(object):
|
| 424 | """Interface used by ArithEvaluator / BoolEvaluator"""
|
| 425 |
|
| 426 | def __init__(self):
|
| 427 | # type: () -> None
|
| 428 | """Empty constructor for mycpp."""
|
| 429 | pass
|
| 430 |
|
| 431 | def EvalWordToString(self, w, eval_flags=0):
|
| 432 | # type: (word_t, int) -> value.Str
|
| 433 | raise NotImplementedError()
|
| 434 |
|
| 435 |
|
| 436 | def _GetDollarHyphen(exec_opts):
|
| 437 | # type: (optview.Exec) -> str
|
| 438 | chars = [] # type: List[str]
|
| 439 | if exec_opts.interactive():
|
| 440 | chars.append('i')
|
| 441 |
|
| 442 | if exec_opts.errexit():
|
| 443 | chars.append('e')
|
| 444 | if exec_opts.noglob():
|
| 445 | chars.append('f')
|
| 446 | if exec_opts.noexec():
|
| 447 | chars.append('n')
|
| 448 | if exec_opts.nounset():
|
| 449 | chars.append('u')
|
| 450 | # NO letter for pipefail?
|
| 451 | if exec_opts.xtrace():
|
| 452 | chars.append('x')
|
| 453 | if exec_opts.noclobber():
|
| 454 | chars.append('C')
|
| 455 |
|
| 456 | # bash has:
|
| 457 | # - c for sh -c, i for sh -i (mksh also has this)
|
| 458 | # - h for hashing (mksh also has this)
|
| 459 | # - B for brace expansion
|
| 460 | return ''.join(chars)
|
| 461 |
|
| 462 |
|
| 463 | class TildeEvaluator(object):
|
| 464 |
|
| 465 | def __init__(self, mem, exec_opts):
|
| 466 | # type: (Mem, optview.Exec) -> None
|
| 467 | self.mem = mem
|
| 468 | self.exec_opts = exec_opts
|
| 469 |
|
| 470 | def GetMyHomeDir(self):
|
| 471 | # type: () -> Optional[str]
|
| 472 | """Consult $HOME first, and then make a libc call.
|
| 473 |
|
| 474 | Important: the libc call can FAIL, which is why we prefer $HOME. See issue
|
| 475 | #1578.
|
| 476 | """
|
| 477 | # First look up the HOME var, then ask the OS. This is what bash does.
|
| 478 | val = self.mem.GetValue('HOME')
|
| 479 | UP_val = val
|
| 480 | if val.tag() == value_e.Str:
|
| 481 | val = cast(value.Str, UP_val)
|
| 482 | return val.s
|
| 483 | return pyos.GetMyHomeDir()
|
| 484 |
|
| 485 | def Eval(self, part):
|
| 486 | # type: (word_part.TildeSub) -> str
|
| 487 | """Evaluates ~ and ~user, given a Lit_TildeLike token."""
|
| 488 |
|
| 489 | if part.user_name is None:
|
| 490 | result = self.GetMyHomeDir()
|
| 491 | else:
|
| 492 | result = pyos.GetHomeDir(part.user_name)
|
| 493 |
|
| 494 | if result is None:
|
| 495 | if self.exec_opts.strict_tilde():
|
| 496 | e_die("Error expanding tilde (e.g. invalid user)", part.left)
|
| 497 | else:
|
| 498 | # Return ~ or ~user literally
|
| 499 | result = '~'
|
| 500 | if part.user_name is not None:
|
| 501 | result = result + part.user_name # mycpp doesn't have +=
|
| 502 |
|
| 503 | return result
|
| 504 |
|
| 505 |
|
| 506 | class AbstractWordEvaluator(StringWordEvaluator):
|
| 507 | """Abstract base class for word evaluators.
|
| 508 |
|
| 509 | Public entry points:
|
| 510 | EvalWordToString EvalForPlugin EvalRhsWord
|
| 511 | EvalWordSequence EvalWordSequence2
|
| 512 | """
|
| 513 |
|
| 514 | def __init__(
|
| 515 | self,
|
| 516 | mem, # type: state.Mem
|
| 517 | exec_opts, # type: optview.Exec
|
| 518 | mutable_opts, # type: state.MutableOpts
|
| 519 | tilde_ev, # type: TildeEvaluator
|
| 520 | splitter, # type: SplitContext
|
| 521 | errfmt, # type: ui.ErrorFormatter
|
| 522 | ):
|
| 523 | # type: (...) -> None
|
| 524 | self.arith_ev = None # type: sh_expr_eval.ArithEvaluator
|
| 525 | self.expr_ev = None # type: expr_eval.ExprEvaluator
|
| 526 | self.prompt_ev = None # type: prompt.Evaluator
|
| 527 |
|
| 528 | self.unsafe_arith = None # type: sh_expr_eval.UnsafeArith
|
| 529 |
|
| 530 | self.tilde_ev = tilde_ev
|
| 531 |
|
| 532 | self.mem = mem # for $HOME, $1, etc.
|
| 533 | self.exec_opts = exec_opts # for nounset
|
| 534 | self.mutable_opts = mutable_opts # for _allow_command_sub
|
| 535 | self.splitter = splitter
|
| 536 | self.errfmt = errfmt
|
| 537 |
|
| 538 | self.globber = glob_.Globber(exec_opts)
|
| 539 |
|
| 540 | def CheckCircularDeps(self):
|
| 541 | # type: () -> None
|
| 542 | raise NotImplementedError()
|
| 543 |
|
| 544 | def _EvalCommandSub(self, cs_part, quoted):
|
| 545 | # type: (CommandSub, bool) -> part_value_t
|
| 546 | """Abstract since it has a side effect."""
|
| 547 | raise NotImplementedError()
|
| 548 |
|
| 549 | def _EvalProcessSub(self, cs_part):
|
| 550 | # type: (CommandSub) -> part_value_t
|
| 551 | """Abstract since it has a side effect."""
|
| 552 | raise NotImplementedError()
|
| 553 |
|
| 554 | def _EvalVarNum(self, var_num):
|
| 555 | # type: (int) -> value_t
|
| 556 | assert var_num >= 0
|
| 557 | return self.mem.GetArgNum(var_num)
|
| 558 |
|
| 559 | def _EvalSpecialVar(self, op_id, quoted, vsub_state):
|
| 560 | # type: (int, bool, VarSubState) -> value_t
|
| 561 | """Evaluate $?
|
| 562 |
|
| 563 | and so forth
|
| 564 | """
|
| 565 | # $@ is special -- it need to know whether it is in a double quoted
|
| 566 | # context.
|
| 567 | #
|
| 568 | # - If it's $@ in a double quoted context, return an ARRAY.
|
| 569 | # - If it's $@ in a normal context, return a STRING, which then will be
|
| 570 | # subject to splitting.
|
| 571 |
|
| 572 | if op_id in (Id.VSub_At, Id.VSub_Star):
|
| 573 | argv = self.mem.GetArgv()
|
| 574 | val = value.BashArray(argv) # type: value_t
|
| 575 | if op_id == Id.VSub_At:
|
| 576 | # "$@" evaluates to an array, $@ should be decayed
|
| 577 | vsub_state.join_array = not quoted
|
| 578 | else: # $* "$*" are both decayed
|
| 579 | vsub_state.join_array = True
|
| 580 |
|
| 581 | elif op_id == Id.VSub_Hyphen:
|
| 582 | val = value.Str(_GetDollarHyphen(self.exec_opts))
|
| 583 |
|
| 584 | else:
|
| 585 | val = self.mem.GetSpecialVar(op_id)
|
| 586 |
|
| 587 | return val
|
| 588 |
|
| 589 | def _ApplyTestOp(
|
| 590 | self,
|
| 591 | val, # type: value_t
|
| 592 | op, # type: suffix_op.Unary
|
| 593 | quoted, # type: bool
|
| 594 | part_vals, # type: Optional[List[part_value_t]]
|
| 595 | vtest_place, # type: VTestPlace
|
| 596 | blame_token, # type: Token
|
| 597 | ):
|
| 598 | # type: (...) -> bool
|
| 599 | """
|
| 600 | Returns:
|
| 601 | Whether part_vals was mutated
|
| 602 |
|
| 603 | ${a:-} returns part_value[]
|
| 604 | ${a:+} returns part_value[]
|
| 605 | ${a:?error} returns error word?
|
| 606 | ${a:=} returns part_value[] but also needs self.mem for side effects.
|
| 607 |
|
| 608 | So I guess it should return part_value[], and then a flag for raising an
|
| 609 | error, and then a flag for assigning it?
|
| 610 | The original BracedVarSub will have the name.
|
| 611 |
|
| 612 | Example of needing multiple part_value[]
|
| 613 |
|
| 614 | echo X-${a:-'def'"ault"}-X
|
| 615 |
|
| 616 | We return two part values from the BracedVarSub. Also consider:
|
| 617 |
|
| 618 | echo ${a:-x"$@"x}
|
| 619 | """
|
| 620 | eval_flags = IS_SUBST
|
| 621 | if quoted:
|
| 622 | eval_flags |= QUOTED
|
| 623 |
|
| 624 | tok = op.op
|
| 625 | # NOTE: Splicing part_values is necessary because of code like
|
| 626 | # ${undef:-'a b' c 'd # e'}. Each part_value can have a different
|
| 627 | # do_glob/do_elide setting.
|
| 628 | UP_val = val
|
| 629 | with tagswitch(val) as case:
|
| 630 | if case(value_e.Undef):
|
| 631 | is_falsey = True
|
| 632 |
|
| 633 | elif case(value_e.Str):
|
| 634 | val = cast(value.Str, UP_val)
|
| 635 | if tok.id in (Id.VTest_ColonHyphen, Id.VTest_ColonEquals,
|
| 636 | Id.VTest_ColonQMark, Id.VTest_ColonPlus):
|
| 637 | is_falsey = len(val.s) == 0
|
| 638 | else:
|
| 639 | is_falsey = False
|
| 640 |
|
| 641 | elif case(value_e.BashArray):
|
| 642 | val = cast(value.BashArray, UP_val)
|
| 643 | # TODO: allow undefined
|
| 644 | is_falsey = len(val.strs) == 0
|
| 645 |
|
| 646 | elif case(value_e.BashAssoc):
|
| 647 | val = cast(value.BashAssoc, UP_val)
|
| 648 | is_falsey = len(val.d) == 0
|
| 649 |
|
| 650 | else:
|
| 651 | # value.Eggex, etc. are all false
|
| 652 | is_falsey = False
|
| 653 |
|
| 654 | if tok.id in (Id.VTest_ColonHyphen, Id.VTest_Hyphen):
|
| 655 | if is_falsey:
|
| 656 | self._EvalRhsWordToParts(op.arg_word, part_vals, eval_flags)
|
| 657 | return True
|
| 658 | else:
|
| 659 | return False
|
| 660 |
|
| 661 | # Inverse of the above.
|
| 662 | elif tok.id in (Id.VTest_ColonPlus, Id.VTest_Plus):
|
| 663 | if is_falsey:
|
| 664 | return False
|
| 665 | else:
|
| 666 | self._EvalRhsWordToParts(op.arg_word, part_vals, eval_flags)
|
| 667 | return True
|
| 668 |
|
| 669 | # Splice and assign
|
| 670 | elif tok.id in (Id.VTest_ColonEquals, Id.VTest_Equals):
|
| 671 | if is_falsey:
|
| 672 | # Collect new part vals.
|
| 673 | assign_part_vals = [] # type: List[part_value_t]
|
| 674 | self._EvalRhsWordToParts(op.arg_word, assign_part_vals,
|
| 675 | eval_flags)
|
| 676 | # Append them to out param AND return them.
|
| 677 | part_vals.extend(assign_part_vals)
|
| 678 |
|
| 679 | if vtest_place.name is None:
|
| 680 | # TODO: error context
|
| 681 | e_die("Can't assign to special variable")
|
| 682 | else:
|
| 683 | # NOTE: This decays arrays too! 'shopt -s strict_array' could
|
| 684 | # avoid it.
|
| 685 | rhs_str = _DecayPartValuesToString(
|
| 686 | assign_part_vals, self.splitter.GetJoinChar())
|
| 687 | if vtest_place.index is None: # using None when no index
|
| 688 | lval = location.LName(
|
| 689 | vtest_place.name) # type: sh_lvalue_t
|
| 690 | else:
|
| 691 | var_name = vtest_place.name
|
| 692 | var_index = vtest_place.index
|
| 693 | UP_var_index = var_index
|
| 694 |
|
| 695 | with tagswitch(var_index) as case:
|
| 696 | if case(a_index_e.Int):
|
| 697 | var_index = cast(a_index.Int, UP_var_index)
|
| 698 | lval = sh_lvalue.Indexed(
|
| 699 | var_name, var_index.i, loc.Missing)
|
| 700 | elif case(a_index_e.Str):
|
| 701 | var_index = cast(a_index.Str, UP_var_index)
|
| 702 | lval = sh_lvalue.Keyed(var_name, var_index.s,
|
| 703 | loc.Missing)
|
| 704 | else:
|
| 705 | raise AssertionError()
|
| 706 |
|
| 707 | state.OshLanguageSetValue(self.mem, lval,
|
| 708 | value.Str(rhs_str))
|
| 709 | return True
|
| 710 |
|
| 711 | else:
|
| 712 | return False
|
| 713 |
|
| 714 | elif tok.id in (Id.VTest_ColonQMark, Id.VTest_QMark):
|
| 715 | if is_falsey:
|
| 716 | # The arg is the error message
|
| 717 | error_part_vals = [] # type: List[part_value_t]
|
| 718 | self._EvalRhsWordToParts(op.arg_word, error_part_vals,
|
| 719 | eval_flags)
|
| 720 | error_str = _DecayPartValuesToString(
|
| 721 | error_part_vals, self.splitter.GetJoinChar())
|
| 722 |
|
| 723 | #
|
| 724 | # Display fancy/helpful error
|
| 725 | #
|
| 726 | if vtest_place.name is None:
|
| 727 | var_name = '???'
|
| 728 | else:
|
| 729 | var_name = vtest_place.name
|
| 730 |
|
| 731 | if 0:
|
| 732 | # This hint is nice, but looks too noisy for now
|
| 733 | op_str = lexer.LazyStr(tok)
|
| 734 | if tok.id == Id.VTest_ColonQMark:
|
| 735 | why = 'empty or unset'
|
| 736 | else:
|
| 737 | why = 'unset'
|
| 738 |
|
| 739 | self.errfmt.Print_(
|
| 740 | "Hint: operator %s means a variable can't be %s" %
|
| 741 | (op_str, why), tok)
|
| 742 |
|
| 743 | if val.tag() == value_e.Undef:
|
| 744 | actual = 'unset'
|
| 745 | else:
|
| 746 | actual = 'empty'
|
| 747 |
|
| 748 | if len(error_str):
|
| 749 | suffix = ': %r' % error_str
|
| 750 | else:
|
| 751 | suffix = ''
|
| 752 | e_die("Var %s is %s%s" % (var_name, actual, suffix),
|
| 753 | blame_token)
|
| 754 |
|
| 755 | else:
|
| 756 | return False
|
| 757 |
|
| 758 | else:
|
| 759 | raise AssertionError(tok.id)
|
| 760 |
|
| 761 | def _Length(self, val, token):
|
| 762 | # type: (value_t, Token) -> int
|
| 763 | """Returns the length of the value, for ${#var}"""
|
| 764 | UP_val = val
|
| 765 | with tagswitch(val) as case:
|
| 766 | if case(value_e.Str):
|
| 767 | val = cast(value.Str, UP_val)
|
| 768 | # NOTE: Whether bash counts bytes or chars is affected by LANG
|
| 769 | # environment variables.
|
| 770 | # Should we respect that, or another way to select? set -o
|
| 771 | # count-bytes?
|
| 772 |
|
| 773 | # https://stackoverflow.com/questions/17368067/length-of-string-in-bash
|
| 774 | try:
|
| 775 | length = string_ops.CountUtf8Chars(val.s)
|
| 776 | except error.Strict as e:
|
| 777 | # Add this here so we don't have to add it so far down the stack.
|
| 778 | # TODO: It's better to show BOTH this CODE an the actual DATA
|
| 779 | # somehow.
|
| 780 | e.location = token
|
| 781 |
|
| 782 | if self.exec_opts.strict_word_eval():
|
| 783 | raise
|
| 784 | else:
|
| 785 | # NOTE: Doesn't make the command exit with 1; it just returns a
|
| 786 | # length of -1.
|
| 787 | self.errfmt.PrettyPrintError(e, prefix='warning: ')
|
| 788 | return -1
|
| 789 |
|
| 790 | elif case(value_e.BashArray):
|
| 791 | val = cast(value.BashArray, UP_val)
|
| 792 | # There can be empty placeholder values in the array.
|
| 793 | length = 0
|
| 794 | for s in val.strs:
|
| 795 | if s is not None:
|
| 796 | length += 1
|
| 797 |
|
| 798 | elif case(value_e.BashAssoc):
|
| 799 | val = cast(value.BashAssoc, UP_val)
|
| 800 | length = len(val.d)
|
| 801 |
|
| 802 | else:
|
| 803 | raise error.TypeErr(
|
| 804 | val, "Length op expected Str, BashArray, BashAssoc", token)
|
| 805 |
|
| 806 | return length
|
| 807 |
|
| 808 | def _Keys(self, val, token):
|
| 809 | # type: (value_t, Token) -> value_t
|
| 810 | """Return keys of a container, for ${!array[@]}"""
|
| 811 |
|
| 812 | UP_val = val
|
| 813 | with tagswitch(val) as case:
|
| 814 | if case(value_e.BashArray):
|
| 815 | val = cast(value.BashArray, UP_val)
|
| 816 | # translation issue: tuple indices not supported in list comprehensions
|
| 817 | #indices = [str(i) for i, s in enumerate(val.strs) if s is not None]
|
| 818 | indices = [] # type: List[str]
|
| 819 | for i, s in enumerate(val.strs):
|
| 820 | if s is not None:
|
| 821 | indices.append(str(i))
|
| 822 | return value.BashArray(indices)
|
| 823 |
|
| 824 | elif case(value_e.BashAssoc):
|
| 825 | val = cast(value.BashAssoc, UP_val)
|
| 826 | assert val.d is not None # for MyPy, so it's not Optional[]
|
| 827 |
|
| 828 | # BUG: Keys aren't ordered according to insertion!
|
| 829 | return value.BashArray(val.d.keys())
|
| 830 |
|
| 831 | else:
|
| 832 | raise error.TypeErr(val, 'Keys op expected Str', token)
|
| 833 |
|
| 834 | def _EvalVarRef(self, val, blame_tok, quoted, vsub_state, vtest_place):
|
| 835 | # type: (value_t, Token, bool, VarSubState, VTestPlace) -> value_t
|
| 836 | """Handles indirect expansion like ${!var} and ${!a[0]}.
|
| 837 |
|
| 838 | Args:
|
| 839 | blame_tok: 'foo' for ${!foo}
|
| 840 | """
|
| 841 | UP_val = val
|
| 842 | with tagswitch(val) as case:
|
| 843 | if case(value_e.Undef):
|
| 844 | return value.Undef # ${!undef} is just weird bash behavior
|
| 845 |
|
| 846 | elif case(value_e.Str):
|
| 847 | val = cast(value.Str, UP_val)
|
| 848 | bvs_part = self.unsafe_arith.ParseVarRef(val.s, blame_tok)
|
| 849 | return self._VarRefValue(bvs_part, quoted, vsub_state,
|
| 850 | vtest_place)
|
| 851 |
|
| 852 | elif case(value_e.BashArray): # caught earlier but OK
|
| 853 | e_die('Indirect expansion of array')
|
| 854 |
|
| 855 | elif case(value_e.BashAssoc): # caught earlier but OK
|
| 856 | e_die('Indirect expansion of assoc array')
|
| 857 |
|
| 858 | else:
|
| 859 | raise error.TypeErr(val, 'Var Ref op expected Str', blame_tok)
|
| 860 |
|
| 861 | def _ApplyUnarySuffixOp(self, val, op):
|
| 862 | # type: (value_t, suffix_op.Unary) -> value_t
|
| 863 | assert val.tag() != value_e.Undef
|
| 864 |
|
| 865 | op_kind = consts.GetKind(op.op.id)
|
| 866 |
|
| 867 | if op_kind == Kind.VOp1:
|
| 868 | # NOTE: glob syntax is supported in ^ ^^ , ,, ! As well as % %% # ##.
|
| 869 | # Detect has_extglob so that DoUnarySuffixOp doesn't use the fast
|
| 870 | # shortcut for constant strings.
|
| 871 | arg_val, has_extglob = self.EvalWordToPattern(op.arg_word)
|
| 872 | assert arg_val.tag() == value_e.Str
|
| 873 |
|
| 874 | UP_val = val
|
| 875 | with tagswitch(val) as case:
|
| 876 | if case(value_e.Str):
|
| 877 | val = cast(value.Str, UP_val)
|
| 878 | s = string_ops.DoUnarySuffixOp(val.s, op.op, arg_val.s,
|
| 879 | has_extglob)
|
| 880 | #log('%r %r -> %r', val.s, arg_val.s, s)
|
| 881 | new_val = value.Str(s) # type: value_t
|
| 882 |
|
| 883 | elif case(value_e.BashArray):
|
| 884 | val = cast(value.BashArray, UP_val)
|
| 885 | # ${a[@]#prefix} is VECTORIZED on arrays. YSH should have this too.
|
| 886 | strs = [] # type: List[str]
|
| 887 | for s in val.strs:
|
| 888 | if s is not None:
|
| 889 | strs.append(
|
| 890 | string_ops.DoUnarySuffixOp(
|
| 891 | s, op.op, arg_val.s, has_extglob))
|
| 892 | new_val = value.BashArray(strs)
|
| 893 |
|
| 894 | elif case(value_e.BashAssoc):
|
| 895 | val = cast(value.BashAssoc, UP_val)
|
| 896 | strs = []
|
| 897 | for s in val.d.values():
|
| 898 | strs.append(
|
| 899 | string_ops.DoUnarySuffixOp(s, op.op, arg_val.s,
|
| 900 | has_extglob))
|
| 901 | new_val = value.BashArray(strs)
|
| 902 |
|
| 903 | else:
|
| 904 | raise error.TypeErr(
|
| 905 | val, 'Unary op expected Str, BashArray, BashAssoc',
|
| 906 | op.op)
|
| 907 |
|
| 908 | else:
|
| 909 | raise AssertionError(Kind_str(op_kind))
|
| 910 |
|
| 911 | return new_val
|
| 912 |
|
| 913 | def _PatSub(self, val, op):
|
| 914 | # type: (value_t, suffix_op.PatSub) -> value_t
|
| 915 |
|
| 916 | pat_val, has_extglob = self.EvalWordToPattern(op.pat)
|
| 917 | # Extended globs aren't supported because we only translate * ? etc. to
|
| 918 | # ERE. I don't think there's a straightforward translation from !(*.py) to
|
| 919 | # ERE! You would need an engine that supports negation? (Derivatives?)
|
| 920 | if has_extglob:
|
| 921 | e_die('extended globs not supported in ${x//GLOB/}', op.pat)
|
| 922 |
|
| 923 | if op.replace:
|
| 924 | replace_val = self.EvalRhsWord(op.replace)
|
| 925 | # Can't have an array, so must be a string
|
| 926 | assert replace_val.tag() == value_e.Str, replace_val
|
| 927 | replace_str = cast(value.Str, replace_val).s
|
| 928 | else:
|
| 929 | replace_str = ''
|
| 930 |
|
| 931 | # note: doesn't support self.exec_opts.extglob()!
|
| 932 | regex, warnings = glob_.GlobToERE(pat_val.s)
|
| 933 | if len(warnings):
|
| 934 | # TODO:
|
| 935 | # - Add 'shopt -s strict_glob' mode and expose warnings.
|
| 936 | # "Glob is not in CANONICAL FORM".
|
| 937 | # - Propagate location info back to the 'op.pat' word.
|
| 938 | pass
|
| 939 | #log('regex %r', regex)
|
| 940 | replacer = string_ops.GlobReplacer(regex, replace_str, op.slash_tok)
|
| 941 |
|
| 942 | with tagswitch(val) as case2:
|
| 943 | if case2(value_e.Str):
|
| 944 | str_val = cast(value.Str, val)
|
| 945 | s = replacer.Replace(str_val.s, op)
|
| 946 | val = value.Str(s)
|
| 947 |
|
| 948 | elif case2(value_e.BashArray):
|
| 949 | array_val = cast(value.BashArray, val)
|
| 950 | strs = [] # type: List[str]
|
| 951 | for s in array_val.strs:
|
| 952 | if s is not None:
|
| 953 | strs.append(replacer.Replace(s, op))
|
| 954 | val = value.BashArray(strs)
|
| 955 |
|
| 956 | elif case2(value_e.BashAssoc):
|
| 957 | assoc_val = cast(value.BashAssoc, val)
|
| 958 | strs = []
|
| 959 | for s in assoc_val.d.values():
|
| 960 | strs.append(replacer.Replace(s, op))
|
| 961 | val = value.BashArray(strs)
|
| 962 |
|
| 963 | else:
|
| 964 | raise error.TypeErr(
|
| 965 | val, 'Pat Sub op expected Str, BashArray, BashAssoc',
|
| 966 | op.slash_tok)
|
| 967 |
|
| 968 | return val
|
| 969 |
|
| 970 | def _Slice(self, val, op, var_name, part):
|
| 971 | # type: (value_t, suffix_op.Slice, Optional[str], BracedVarSub) -> value_t
|
| 972 |
|
| 973 | begin = self.arith_ev.EvalToInt(op.begin)
|
| 974 |
|
| 975 | # Note: bash allows lengths to be negative (with odd semantics), but
|
| 976 | # we don't allow that right now.
|
| 977 | has_length = False
|
| 978 | length = -1
|
| 979 | if op.length:
|
| 980 | has_length = True
|
| 981 | length = self.arith_ev.EvalToInt(op.length)
|
| 982 |
|
| 983 | try:
|
| 984 | arg0_val = None # type: value.Str
|
| 985 | if var_name is None: # $* or $@
|
| 986 | arg0_val = self.mem.GetArg0()
|
| 987 | val = _PerformSlice(val, begin, length, has_length, part, arg0_val)
|
| 988 | except error.Strict as e:
|
| 989 | if self.exec_opts.strict_word_eval():
|
| 990 | raise
|
| 991 | else:
|
| 992 | self.errfmt.PrettyPrintError(e, prefix='warning: ')
|
| 993 | with tagswitch(val) as case2:
|
| 994 | if case2(value_e.Str):
|
| 995 | val = value.Str('')
|
| 996 | elif case2(value_e.BashArray):
|
| 997 | val = value.BashArray([])
|
| 998 | else:
|
| 999 | raise NotImplementedError()
|
| 1000 | return val
|
| 1001 |
|
| 1002 | def _Nullary(self, val, op, var_name):
|
| 1003 | # type: (value_t, Token, Optional[str]) -> Tuple[value.Str, bool]
|
| 1004 |
|
| 1005 | UP_val = val
|
| 1006 | quoted2 = False
|
| 1007 | op_id = op.id
|
| 1008 | if op_id == Id.VOp0_P:
|
| 1009 | with tagswitch(val) as case:
|
| 1010 | if case(value_e.Str):
|
| 1011 | str_val = cast(value.Str, UP_val)
|
| 1012 | prompt = self.prompt_ev.EvalPrompt(str_val)
|
| 1013 | # readline gets rid of these, so we should too.
|
| 1014 | p = prompt.replace('\x01', '').replace('\x02', '')
|
| 1015 | result = value.Str(p)
|
| 1016 | else:
|
| 1017 | e_die("Can't use @P on %s" % ui.ValType(val), op)
|
| 1018 |
|
| 1019 | elif op_id == Id.VOp0_Q:
|
| 1020 | with tagswitch(val) as case:
|
| 1021 | if case(value_e.Str):
|
| 1022 | str_val = cast(value.Str, UP_val)
|
| 1023 | result = value.Str(j8_lite.MaybeShellEncode(str_val.s))
|
| 1024 | # oddly, 'echo ${x@Q}' is equivalent to 'echo "${x@Q}"' in
|
| 1025 | # bash
|
| 1026 | quoted2 = True
|
| 1027 | elif case(value_e.BashArray):
|
| 1028 | array_val = cast(value.BashArray, UP_val)
|
| 1029 |
|
| 1030 | # TODO: should use fastfunc.ShellEncode
|
| 1031 | tmp = [j8_lite.MaybeShellEncode(s) for s in array_val.strs]
|
| 1032 | result = value.Str(' '.join(tmp))
|
| 1033 | else:
|
| 1034 | e_die("Can't use @Q on %s" % ui.ValType(val), op)
|
| 1035 |
|
| 1036 | elif op_id == Id.VOp0_a:
|
| 1037 | # We're ONLY simluating -a and -A, not -r -x -n for now. See
|
| 1038 | # spec/ble-idioms.test.sh.
|
| 1039 | chars = [] # type: List[str]
|
| 1040 | with tagswitch(val) as case:
|
| 1041 | if case(value_e.BashArray):
|
| 1042 | chars.append('a')
|
| 1043 | elif case(value_e.BashAssoc):
|
| 1044 | chars.append('A')
|
| 1045 |
|
| 1046 | if var_name is not None: # e.g. ${?@a} is allowed
|
| 1047 | cell = self.mem.GetCell(var_name)
|
| 1048 | if cell:
|
| 1049 | if cell.readonly:
|
| 1050 | chars.append('r')
|
| 1051 | if cell.exported:
|
| 1052 | chars.append('x')
|
| 1053 | if cell.nameref:
|
| 1054 | chars.append('n')
|
| 1055 |
|
| 1056 | result = value.Str(''.join(chars))
|
| 1057 |
|
| 1058 | else:
|
| 1059 | e_die('Var op %r not implemented' % lexer.TokenVal(op), op)
|
| 1060 |
|
| 1061 | return result, quoted2
|
| 1062 |
|
| 1063 | def _WholeArray(self, val, part, quoted, vsub_state):
|
| 1064 | # type: (value_t, BracedVarSub, bool, VarSubState) -> value_t
|
| 1065 | op_id = cast(bracket_op.WholeArray, part.bracket_op).op_id
|
| 1066 |
|
| 1067 | if op_id == Id.Lit_At:
|
| 1068 | vsub_state.join_array = not quoted # ${a[@]} decays but "${a[@]}" doesn't
|
| 1069 | UP_val = val
|
| 1070 | with tagswitch(val) as case2:
|
| 1071 | if case2(value_e.Undef):
|
| 1072 | if not vsub_state.has_test_op:
|
| 1073 | val = self._EmptyBashArrayOrError(part.token)
|
| 1074 | elif case2(value_e.Str):
|
| 1075 | if self.exec_opts.strict_array():
|
| 1076 | e_die("Can't index string with @", loc.WordPart(part))
|
| 1077 | elif case2(value_e.BashArray):
|
| 1078 | pass # no-op
|
| 1079 |
|
| 1080 | elif op_id == Id.Arith_Star:
|
| 1081 | vsub_state.join_array = True # both ${a[*]} and "${a[*]}" decay
|
| 1082 | UP_val = val
|
| 1083 | with tagswitch(val) as case2:
|
| 1084 | if case2(value_e.Undef):
|
| 1085 | if not vsub_state.has_test_op:
|
| 1086 | val = self._EmptyBashArrayOrError(part.token)
|
| 1087 | elif case2(value_e.Str):
|
| 1088 | if self.exec_opts.strict_array():
|
| 1089 | e_die("Can't index string with *", loc.WordPart(part))
|
| 1090 | elif case2(value_e.BashArray):
|
| 1091 | pass # no-op
|
| 1092 |
|
| 1093 | else:
|
| 1094 | raise AssertionError(op_id) # unknown
|
| 1095 |
|
| 1096 | return val
|
| 1097 |
|
| 1098 | def _ArrayIndex(self, val, part, vtest_place):
|
| 1099 | # type: (value_t, BracedVarSub, VTestPlace) -> value_t
|
| 1100 | """Process a numeric array index like ${a[i+1]}"""
|
| 1101 | anode = cast(bracket_op.ArrayIndex, part.bracket_op).expr
|
| 1102 |
|
| 1103 | UP_val = val
|
| 1104 | with tagswitch(val) as case2:
|
| 1105 | if case2(value_e.Undef):
|
| 1106 | pass # it will be checked later
|
| 1107 |
|
| 1108 | elif case2(value_e.Str):
|
| 1109 | # Bash treats any string as an array, so we can't add our own
|
| 1110 | # behavior here without making valid OSH invalid bash.
|
| 1111 | e_die("Can't index string %r with integer" % part.var_name,
|
| 1112 | part.token)
|
| 1113 |
|
| 1114 | elif case2(value_e.BashArray):
|
| 1115 | array_val = cast(value.BashArray, UP_val)
|
| 1116 | index = self.arith_ev.EvalToInt(anode)
|
| 1117 | vtest_place.index = a_index.Int(index)
|
| 1118 |
|
| 1119 | s = GetArrayItem(array_val.strs, index)
|
| 1120 |
|
| 1121 | if s is None:
|
| 1122 | val = value.Undef
|
| 1123 | else:
|
| 1124 | val = value.Str(s)
|
| 1125 |
|
| 1126 | elif case2(value_e.BashAssoc):
|
| 1127 | assoc_val = cast(value.BashAssoc, UP_val)
|
| 1128 | # Location could also be attached to bracket_op? But
|
| 1129 | # arith_expr.VarSub works OK too
|
| 1130 | key = self.arith_ev.EvalWordToString(
|
| 1131 | anode, blame_loc=location.TokenForArith(anode))
|
| 1132 |
|
| 1133 | vtest_place.index = a_index.Str(key) # out param
|
| 1134 | s = assoc_val.d.get(key)
|
| 1135 |
|
| 1136 | if s is None:
|
| 1137 | val = value.Undef
|
| 1138 | else:
|
| 1139 | val = value.Str(s)
|
| 1140 |
|
| 1141 | else:
|
| 1142 | raise error.TypeErr(val,
|
| 1143 | 'Index op expected BashArray, BashAssoc',
|
| 1144 | loc.WordPart(part))
|
| 1145 |
|
| 1146 | return val
|
| 1147 |
|
| 1148 | def _EvalDoubleQuoted(self, parts, part_vals):
|
| 1149 | # type: (List[word_part_t], List[part_value_t]) -> None
|
| 1150 | """Evaluate parts of a DoubleQuoted part.
|
| 1151 |
|
| 1152 | Args:
|
| 1153 | part_vals: output param to append to.
|
| 1154 | """
|
| 1155 | # Example of returning array:
|
| 1156 | # $ a=(1 2); b=(3); $ c=(4 5)
|
| 1157 | # $ argv "${a[@]}${b[@]}${c[@]}"
|
| 1158 | # ['1', '234', '5']
|
| 1159 | #
|
| 1160 | # Example of multiple parts
|
| 1161 | # $ argv "${a[@]}${undef[@]:-${c[@]}}"
|
| 1162 | # ['1', '24', '5']
|
| 1163 |
|
| 1164 | # Special case for "". The parser outputs (DoubleQuoted []), instead
|
| 1165 | # of (DoubleQuoted [Literal '']). This is better but it means we
|
| 1166 | # have to check for it.
|
| 1167 | if len(parts) == 0:
|
| 1168 | v = Piece('', True, False)
|
| 1169 | part_vals.append(v)
|
| 1170 | return
|
| 1171 |
|
| 1172 | for p in parts:
|
| 1173 | self._EvalWordPart(p, part_vals, QUOTED)
|
| 1174 |
|
| 1175 | def EvalDoubleQuotedToString(self, dq_part):
|
| 1176 | # type: (DoubleQuoted) -> str
|
| 1177 | """For double quoted strings in YSH expressions.
|
| 1178 |
|
| 1179 | Example: var x = "$foo-${foo}"
|
| 1180 | """
|
| 1181 | part_vals = [] # type: List[part_value_t]
|
| 1182 | self._EvalDoubleQuoted(dq_part.parts, part_vals)
|
| 1183 | return self._ConcatPartVals(part_vals, dq_part.left)
|
| 1184 |
|
| 1185 | def _DecayArray(self, val):
|
| 1186 | # type: (value.BashArray) -> value.Str
|
| 1187 | """Decay $* to a string."""
|
| 1188 | assert val.tag() == value_e.BashArray, val
|
| 1189 | sep = self.splitter.GetJoinChar()
|
| 1190 | tmp = [s for s in val.strs if s is not None]
|
| 1191 | return value.Str(sep.join(tmp))
|
| 1192 |
|
| 1193 | def _EmptyStrOrError(self, val, token):
|
| 1194 | # type: (value_t, Token) -> value_t
|
| 1195 | if val.tag() != value_e.Undef:
|
| 1196 | return val
|
| 1197 |
|
| 1198 | if not self.exec_opts.nounset():
|
| 1199 | return value.Str('')
|
| 1200 |
|
| 1201 | tok_str = lexer.TokenVal(token)
|
| 1202 | name = tok_str[1:] if tok_str.startswith('$') else tok_str
|
| 1203 | e_die('Undefined variable %r' % name, token)
|
| 1204 |
|
| 1205 | def _EmptyBashArrayOrError(self, token):
|
| 1206 | # type: (Token) -> value_t
|
| 1207 | assert token is not None
|
| 1208 | if self.exec_opts.nounset():
|
| 1209 | e_die('Undefined array %r' % lexer.TokenVal(token), token)
|
| 1210 | else:
|
| 1211 | return value.BashArray([])
|
| 1212 |
|
| 1213 | def _EvalBracketOp(self, val, part, quoted, vsub_state, vtest_place):
|
| 1214 | # type: (value_t, BracedVarSub, bool, VarSubState, VTestPlace) -> value_t
|
| 1215 |
|
| 1216 | if part.bracket_op:
|
| 1217 | with tagswitch(part.bracket_op) as case:
|
| 1218 | if case(bracket_op_e.WholeArray):
|
| 1219 | val = self._WholeArray(val, part, quoted, vsub_state)
|
| 1220 |
|
| 1221 | elif case(bracket_op_e.ArrayIndex):
|
| 1222 | val = self._ArrayIndex(val, part, vtest_place)
|
| 1223 |
|
| 1224 | else:
|
| 1225 | raise AssertionError(part.bracket_op.tag())
|
| 1226 |
|
| 1227 | else: # no bracket op
|
| 1228 | var_name = vtest_place.name
|
| 1229 | if (var_name is not None and
|
| 1230 | val.tag() in (value_e.BashArray, value_e.BashAssoc) and
|
| 1231 | not vsub_state.is_type_query):
|
| 1232 | if ShouldArrayDecay(var_name, self.exec_opts,
|
| 1233 | not (part.prefix_op or part.suffix_op)):
|
| 1234 | # for ${BASH_SOURCE}, etc.
|
| 1235 | val = DecayArray(val)
|
| 1236 | else:
|
| 1237 | e_die(
|
| 1238 | "Array %r can't be referred to as a scalar (without @ or *)"
|
| 1239 | % var_name, loc.WordPart(part))
|
| 1240 |
|
| 1241 | return val
|
| 1242 |
|
| 1243 | def _VarRefValue(self, part, quoted, vsub_state, vtest_place):
|
| 1244 | # type: (BracedVarSub, bool, VarSubState, VTestPlace) -> value_t
|
| 1245 | """Duplicates some logic from _EvalBracedVarSub, but returns a
|
| 1246 | value_t."""
|
| 1247 |
|
| 1248 | # 1. Evaluate from (var_name, var_num, token Id) -> value
|
| 1249 | if part.token.id == Id.VSub_Name:
|
| 1250 | vtest_place.name = part.var_name
|
| 1251 | val = self.mem.GetValue(part.var_name)
|
| 1252 |
|
| 1253 | elif part.token.id == Id.VSub_Number:
|
| 1254 | var_num = int(part.var_name)
|
| 1255 | val = self._EvalVarNum(var_num)
|
| 1256 |
|
| 1257 | else:
|
| 1258 | # $* decays
|
| 1259 | val = self._EvalSpecialVar(part.token.id, quoted, vsub_state)
|
| 1260 |
|
| 1261 | # We don't need var_index because it's only for L-Values of test ops?
|
| 1262 | if self.exec_opts.eval_unsafe_arith():
|
| 1263 | val = self._EvalBracketOp(val, part, quoted, vsub_state,
|
| 1264 | vtest_place)
|
| 1265 | else:
|
| 1266 | with state.ctx_Option(self.mutable_opts,
|
| 1267 | [option_i._allow_command_sub], False):
|
| 1268 | val = self._EvalBracketOp(val, part, quoted, vsub_state,
|
| 1269 | vtest_place)
|
| 1270 |
|
| 1271 | return val
|
| 1272 |
|
| 1273 | def _EvalBracedVarSub(self, part, part_vals, quoted):
|
| 1274 | # type: (BracedVarSub, List[part_value_t], bool) -> None
|
| 1275 | """
|
| 1276 | Args:
|
| 1277 | part_vals: output param to append to.
|
| 1278 | """
|
| 1279 | # We have different operators that interact in a non-obvious order.
|
| 1280 | #
|
| 1281 | # 1. bracket_op: value -> value, with side effect on vsub_state
|
| 1282 | #
|
| 1283 | # 2. prefix_op
|
| 1284 | # a. length ${#x}: value -> value
|
| 1285 | # b. var ref ${!ref}: can expand to an array
|
| 1286 | #
|
| 1287 | # 3. suffix_op:
|
| 1288 | # a. no operator: you have a value
|
| 1289 | # b. Test: value -> part_value[]
|
| 1290 | # c. Other Suffix: value -> value
|
| 1291 | #
|
| 1292 | # 4. Process vsub_state.join_array here before returning.
|
| 1293 | #
|
| 1294 | # These cases are hard to distinguish:
|
| 1295 | # - ${!prefix@} prefix query
|
| 1296 | # - ${!array[@]} keys
|
| 1297 | # - ${!ref} named reference
|
| 1298 | # - ${!ref[0]} named reference
|
| 1299 | #
|
| 1300 | # I think we need several stages:
|
| 1301 | #
|
| 1302 | # 1. value: name, number, special, prefix query
|
| 1303 | # 2. bracket_op
|
| 1304 | # 3. prefix length -- this is TERMINAL
|
| 1305 | # 4. indirection? Only for some of the ! cases
|
| 1306 | # 5. string transformation suffix ops like ##
|
| 1307 | # 6. test op
|
| 1308 | # 7. vsub_state.join_array
|
| 1309 |
|
| 1310 | # vsub_state.join_array is for joining "${a[*]}" and unquoted ${a[@]} AFTER
|
| 1311 | # suffix ops are applied. If we take the length with a prefix op, the
|
| 1312 | # distinction is ignored.
|
| 1313 |
|
| 1314 | var_name = None # type: Optional[str] # used throughout the function
|
| 1315 | vtest_place = VTestPlace(var_name, None) # For ${foo=default}
|
| 1316 | vsub_state = VarSubState.CreateNull() # for $*, ${a[*]}, etc.
|
| 1317 |
|
| 1318 | # 1. Evaluate from (var_name, var_num, token Id) -> value
|
| 1319 | if part.token.id == Id.VSub_Name:
|
| 1320 | # Handle ${!prefix@} first, since that looks at names and not values
|
| 1321 | # Do NOT handle ${!A[@]@a} here!
|
| 1322 | if (part.prefix_op is not None and part.bracket_op is None and
|
| 1323 | part.suffix_op is not None and
|
| 1324 | part.suffix_op.tag() == suffix_op_e.Nullary):
|
| 1325 | nullary_op = cast(Token, part.suffix_op)
|
| 1326 | # ${!x@} but not ${!x@P}
|
| 1327 | if consts.GetKind(nullary_op.id) == Kind.VOp3:
|
| 1328 | names = self.mem.VarNamesStartingWith(part.var_name)
|
| 1329 | names.sort()
|
| 1330 |
|
| 1331 | if quoted and nullary_op.id == Id.VOp3_At:
|
| 1332 | part_vals.append(part_value.Array(names))
|
| 1333 | else:
|
| 1334 | sep = self.splitter.GetJoinChar()
|
| 1335 | part_vals.append(Piece(sep.join(names), quoted, True))
|
| 1336 | return # EARLY RETURN
|
| 1337 |
|
| 1338 | var_name = part.var_name
|
| 1339 | vtest_place.name = var_name # for _ApplyTestOp
|
| 1340 |
|
| 1341 | val = self.mem.GetValue(var_name)
|
| 1342 |
|
| 1343 | elif part.token.id == Id.VSub_Number:
|
| 1344 | var_num = int(part.var_name)
|
| 1345 | val = self._EvalVarNum(var_num)
|
| 1346 | else:
|
| 1347 | # $* decays
|
| 1348 | val = self._EvalSpecialVar(part.token.id, quoted, vsub_state)
|
| 1349 |
|
| 1350 | suffix_op_ = part.suffix_op
|
| 1351 | if suffix_op_:
|
| 1352 | UP_op = suffix_op_
|
| 1353 | with tagswitch(suffix_op_) as case:
|
| 1354 | if case(suffix_op_e.Nullary):
|
| 1355 | suffix_op_ = cast(Token, UP_op)
|
| 1356 |
|
| 1357 | # Type query ${array@a} is a STRING, not an array
|
| 1358 | # NOTE: ${array@Q} is ${array[0]@Q} in bash, which is different than
|
| 1359 | # ${array[@]@Q}
|
| 1360 | if suffix_op_.id == Id.VOp0_a:
|
| 1361 | vsub_state.is_type_query = True
|
| 1362 |
|
| 1363 | elif case(suffix_op_e.Unary):
|
| 1364 | suffix_op_ = cast(suffix_op.Unary, UP_op)
|
| 1365 |
|
| 1366 | # Do the _EmptyStrOrError/_EmptyBashArrayOrError up front, EXCEPT in
|
| 1367 | # the case of Kind.VTest
|
| 1368 | if consts.GetKind(suffix_op_.op.id) == Kind.VTest:
|
| 1369 | vsub_state.has_test_op = True
|
| 1370 |
|
| 1371 | # 2. Bracket Op
|
| 1372 | val = self._EvalBracketOp(val, part, quoted, vsub_state, vtest_place)
|
| 1373 |
|
| 1374 | if part.prefix_op:
|
| 1375 | if part.prefix_op.id == Id.VSub_Pound: # ${#var} for length
|
| 1376 | if not vsub_state.has_test_op: # undef -> '' BEFORE length
|
| 1377 | val = self._EmptyStrOrError(val, part.token)
|
| 1378 |
|
| 1379 | n = self._Length(val, part.token)
|
| 1380 | part_vals.append(Piece(str(n), quoted, False))
|
| 1381 | return # EARLY EXIT: nothing else can come after length
|
| 1382 |
|
| 1383 | elif part.prefix_op.id == Id.VSub_Bang:
|
| 1384 | if (part.bracket_op and
|
| 1385 | part.bracket_op.tag() == bracket_op_e.WholeArray):
|
| 1386 | if vsub_state.has_test_op:
|
| 1387 | # ${!a[@]-'default'} is a non-fatal runtime error in bash. Here
|
| 1388 | # it's fatal.
|
| 1389 | op_tok = cast(suffix_op.Unary, UP_op).op
|
| 1390 | e_die('Test operation not allowed with ${!array[@]}',
|
| 1391 | op_tok)
|
| 1392 |
|
| 1393 | # ${!array[@]} to get indices/keys
|
| 1394 | val = self._Keys(val, part.token)
|
| 1395 | # already set vsub_State.join_array ABOVE
|
| 1396 | else:
|
| 1397 | # Process ${!ref}. SURPRISE: ${!a[0]} is an indirect expansion unlike
|
| 1398 | # ${!a[@]} !
|
| 1399 | # ${!ref} can expand into an array if ref='array[@]'
|
| 1400 |
|
| 1401 | # Clear it now that we have a var ref
|
| 1402 | vtest_place.name = None
|
| 1403 | vtest_place.index = None
|
| 1404 |
|
| 1405 | val = self._EvalVarRef(val, part.token, quoted, vsub_state,
|
| 1406 | vtest_place)
|
| 1407 |
|
| 1408 | if not vsub_state.has_test_op: # undef -> '' AFTER indirection
|
| 1409 | val = self._EmptyStrOrError(val, part.token)
|
| 1410 |
|
| 1411 | else:
|
| 1412 | raise AssertionError(part.prefix_op)
|
| 1413 |
|
| 1414 | else:
|
| 1415 | if not vsub_state.has_test_op: # undef -> '' if no prefix op
|
| 1416 | val = self._EmptyStrOrError(val, part.token)
|
| 1417 |
|
| 1418 | quoted2 = False # another bit for @Q
|
| 1419 | if suffix_op_:
|
| 1420 | op = suffix_op_ # could get rid of this alias
|
| 1421 |
|
| 1422 | with tagswitch(suffix_op_) as case:
|
| 1423 | if case(suffix_op_e.Nullary):
|
| 1424 | op = cast(Token, UP_op)
|
| 1425 | val, quoted2 = self._Nullary(val, op, var_name)
|
| 1426 |
|
| 1427 | elif case(suffix_op_e.Unary):
|
| 1428 | op = cast(suffix_op.Unary, UP_op)
|
| 1429 | if consts.GetKind(op.op.id) == Kind.VTest:
|
| 1430 | if self._ApplyTestOp(val, op, quoted, part_vals,
|
| 1431 | vtest_place, part.token):
|
| 1432 | # e.g. to evaluate ${undef:-'default'}, we already appended
|
| 1433 | # what we need
|
| 1434 | return
|
| 1435 |
|
| 1436 | else:
|
| 1437 | # Other suffix: value -> value
|
| 1438 | val = self._ApplyUnarySuffixOp(val, op)
|
| 1439 |
|
| 1440 | elif case(suffix_op_e.PatSub): # PatSub, vectorized
|
| 1441 | op = cast(suffix_op.PatSub, UP_op)
|
| 1442 | val = self._PatSub(val, op)
|
| 1443 |
|
| 1444 | elif case(suffix_op_e.Slice):
|
| 1445 | op = cast(suffix_op.Slice, UP_op)
|
| 1446 | val = self._Slice(val, op, var_name, part)
|
| 1447 |
|
| 1448 | elif case(suffix_op_e.Static):
|
| 1449 | op = cast(suffix_op.Static, UP_op)
|
| 1450 | e_die('Not implemented', op.tok)
|
| 1451 |
|
| 1452 | else:
|
| 1453 | raise AssertionError()
|
| 1454 |
|
| 1455 | # After applying suffixes, process join_array here.
|
| 1456 | UP_val = val
|
| 1457 | if val.tag() == value_e.BashArray:
|
| 1458 | array_val = cast(value.BashArray, UP_val)
|
| 1459 | if vsub_state.join_array:
|
| 1460 | val = self._DecayArray(array_val)
|
| 1461 | else:
|
| 1462 | val = array_val
|
| 1463 |
|
| 1464 | # For example, ${a} evaluates to value.Str(), but we want a
|
| 1465 | # Piece().
|
| 1466 | part_val = _ValueToPartValue(val, quoted or quoted2, part)
|
| 1467 | part_vals.append(part_val)
|
| 1468 |
|
| 1469 | def _ConcatPartVals(self, part_vals, location):
|
| 1470 | # type: (List[part_value_t], loc_t) -> str
|
| 1471 |
|
| 1472 | strs = [] # type: List[str]
|
| 1473 | for part_val in part_vals:
|
| 1474 | UP_part_val = part_val
|
| 1475 | with tagswitch(part_val) as case:
|
| 1476 | if case(part_value_e.String):
|
| 1477 | part_val = cast(Piece, UP_part_val)
|
| 1478 | s = part_val.s
|
| 1479 |
|
| 1480 | elif case(part_value_e.Array):
|
| 1481 | part_val = cast(part_value.Array, UP_part_val)
|
| 1482 | if self.exec_opts.strict_array():
|
| 1483 | # Examples: echo f > "$@"; local foo="$@"
|
| 1484 | e_die("Illegal array word part (strict_array)",
|
| 1485 | location)
|
| 1486 | else:
|
| 1487 | # It appears to not respect IFS
|
| 1488 | # TODO: eliminate double join()?
|
| 1489 | tmp = [s for s in part_val.strs if s is not None]
|
| 1490 | s = ' '.join(tmp)
|
| 1491 |
|
| 1492 | else:
|
| 1493 | raise AssertionError()
|
| 1494 |
|
| 1495 | strs.append(s)
|
| 1496 |
|
| 1497 | return ''.join(strs)
|
| 1498 |
|
| 1499 | def EvalBracedVarSubToString(self, part):
|
| 1500 | # type: (BracedVarSub) -> str
|
| 1501 | """For double quoted strings in YSH expressions.
|
| 1502 |
|
| 1503 | Example: var x = "$foo-${foo}"
|
| 1504 | """
|
| 1505 | part_vals = [] # type: List[part_value_t]
|
| 1506 | self._EvalBracedVarSub(part, part_vals, False)
|
| 1507 | # blame ${ location
|
| 1508 | return self._ConcatPartVals(part_vals, part.left)
|
| 1509 |
|
| 1510 | def _EvalSimpleVarSub(self, part, part_vals, quoted):
|
| 1511 | # type: (SimpleVarSub, List[part_value_t], bool) -> None
|
| 1512 |
|
| 1513 | token = part.tok
|
| 1514 |
|
| 1515 | vsub_state = VarSubState.CreateNull()
|
| 1516 |
|
| 1517 | # 1. Evaluate from (var_name, var_num, Token) -> defined, value
|
| 1518 | if token.id == Id.VSub_DollarName:
|
| 1519 | var_name = lexer.LazyStr(token)
|
| 1520 | # TODO: Special case for LINENO
|
| 1521 | val = self.mem.GetValue(var_name)
|
| 1522 | if val.tag() in (value_e.BashArray, value_e.BashAssoc):
|
| 1523 | if ShouldArrayDecay(var_name, self.exec_opts):
|
| 1524 | # for $BASH_SOURCE, etc.
|
| 1525 | val = DecayArray(val)
|
| 1526 | else:
|
| 1527 | e_die(
|
| 1528 | "Array %r can't be referred to as a scalar (without @ or *)"
|
| 1529 | % var_name, token)
|
| 1530 |
|
| 1531 | elif token.id == Id.VSub_Number:
|
| 1532 | var_num = int(lexer.LazyStr(token))
|
| 1533 | val = self._EvalVarNum(var_num)
|
| 1534 |
|
| 1535 | else:
|
| 1536 | val = self._EvalSpecialVar(token.id, quoted, vsub_state)
|
| 1537 |
|
| 1538 | #log('SIMPLE %s', part)
|
| 1539 | val = self._EmptyStrOrError(val, token)
|
| 1540 | UP_val = val
|
| 1541 | if val.tag() == value_e.BashArray:
|
| 1542 | array_val = cast(value.BashArray, UP_val)
|
| 1543 | if vsub_state.join_array:
|
| 1544 | val = self._DecayArray(array_val)
|
| 1545 | else:
|
| 1546 | val = array_val
|
| 1547 |
|
| 1548 | v = _ValueToPartValue(val, quoted, part)
|
| 1549 | part_vals.append(v)
|
| 1550 |
|
| 1551 | def EvalSimpleVarSubToString(self, node):
|
| 1552 | # type: (SimpleVarSub) -> str
|
| 1553 | """For double quoted strings in YSH expressions.
|
| 1554 |
|
| 1555 | Example: var x = "$foo-${foo}"
|
| 1556 | """
|
| 1557 | part_vals = [] # type: List[part_value_t]
|
| 1558 | self._EvalSimpleVarSub(node, part_vals, False)
|
| 1559 | return self._ConcatPartVals(part_vals, node.tok)
|
| 1560 |
|
| 1561 | def _EvalExtGlob(self, part, part_vals):
|
| 1562 | # type: (word_part.ExtGlob, List[part_value_t]) -> None
|
| 1563 | """Evaluate @($x|'foo'|$(hostname)) and flatten it."""
|
| 1564 | op = part.op
|
| 1565 | if op.id == Id.ExtGlob_Comma:
|
| 1566 | op_str = '@('
|
| 1567 | else:
|
| 1568 | op_str = lexer.LazyStr(op)
|
| 1569 | # Do NOT split these.
|
| 1570 | part_vals.append(Piece(op_str, False, False))
|
| 1571 |
|
| 1572 | for i, w in enumerate(part.arms):
|
| 1573 | if i != 0:
|
| 1574 | part_vals.append(Piece('|', False, False)) # separator
|
| 1575 | # FLATTEN the tree of extglob "arms".
|
| 1576 | self._EvalWordToParts(w, part_vals, EXTGLOB_NESTED)
|
| 1577 | part_vals.append(Piece(')', False, False)) # closing )
|
| 1578 |
|
| 1579 | def _TranslateExtGlob(self, part_vals, w, glob_parts, fnmatch_parts):
|
| 1580 | # type: (List[part_value_t], CompoundWord, List[str], List[str]) -> None
|
| 1581 | """Translate a flattened WORD with an ExtGlob part to string patterns.
|
| 1582 |
|
| 1583 | We need both glob and fnmatch patterns. _EvalExtGlob does the
|
| 1584 | flattening.
|
| 1585 | """
|
| 1586 | for i, part_val in enumerate(part_vals):
|
| 1587 | UP_part_val = part_val
|
| 1588 | with tagswitch(part_val) as case:
|
| 1589 | if case(part_value_e.String):
|
| 1590 | part_val = cast(Piece, UP_part_val)
|
| 1591 | if part_val.quoted and not self.exec_opts.noglob():
|
| 1592 | s = glob_.GlobEscape(part_val.s)
|
| 1593 | else:
|
| 1594 | # e.g. the @( and | in @(foo|bar) aren't quoted
|
| 1595 | s = part_val.s
|
| 1596 | glob_parts.append(s)
|
| 1597 | fnmatch_parts.append(s) # from _EvalExtGlob()
|
| 1598 |
|
| 1599 | elif case(part_value_e.Array):
|
| 1600 | # Disallow array
|
| 1601 | e_die(
|
| 1602 | "Extended globs and arrays can't appear in the same word",
|
| 1603 | w)
|
| 1604 |
|
| 1605 | elif case(part_value_e.ExtGlob):
|
| 1606 | part_val = cast(part_value.ExtGlob, UP_part_val)
|
| 1607 | # keep appending fnmatch_parts, but repplace glob_parts with '*'
|
| 1608 | self._TranslateExtGlob(part_val.part_vals, w, [],
|
| 1609 | fnmatch_parts)
|
| 1610 | glob_parts.append('*')
|
| 1611 |
|
| 1612 | else:
|
| 1613 | raise AssertionError()
|
| 1614 |
|
| 1615 | def _EvalWordPart(self, part, part_vals, flags):
|
| 1616 | # type: (word_part_t, List[part_value_t], int) -> None
|
| 1617 | """Evaluate a word part, appending to part_vals
|
| 1618 |
|
| 1619 | Called by _EvalWordToParts, EvalWordToString, and _EvalDoubleQuoted.
|
| 1620 | """
|
| 1621 | quoted = bool(flags & QUOTED)
|
| 1622 | is_subst = bool(flags & IS_SUBST)
|
| 1623 |
|
| 1624 | UP_part = part
|
| 1625 | with tagswitch(part) as case:
|
| 1626 | if case(word_part_e.ShArrayLiteral):
|
| 1627 | part = cast(ShArrayLiteral, UP_part)
|
| 1628 | e_die("Unexpected array literal", loc.WordPart(part))
|
| 1629 | elif case(word_part_e.BashAssocLiteral):
|
| 1630 | part = cast(word_part.BashAssocLiteral, UP_part)
|
| 1631 | e_die("Unexpected associative array literal",
|
| 1632 | loc.WordPart(part))
|
| 1633 |
|
| 1634 | elif case(word_part_e.Literal):
|
| 1635 | part = cast(Token, UP_part)
|
| 1636 | # Split if it's in a substitution.
|
| 1637 | # That is: echo is not split, but ${foo:-echo} is split
|
| 1638 | v = Piece(lexer.LazyStr(part), quoted, is_subst)
|
| 1639 | part_vals.append(v)
|
| 1640 |
|
| 1641 | elif case(word_part_e.EscapedLiteral):
|
| 1642 | part = cast(word_part.EscapedLiteral, UP_part)
|
| 1643 | v = Piece(part.ch, True, False)
|
| 1644 | part_vals.append(v)
|
| 1645 |
|
| 1646 | elif case(word_part_e.SingleQuoted):
|
| 1647 | part = cast(SingleQuoted, UP_part)
|
| 1648 | v = Piece(part.sval, True, False)
|
| 1649 | part_vals.append(v)
|
| 1650 |
|
| 1651 | elif case(word_part_e.DoubleQuoted):
|
| 1652 | part = cast(DoubleQuoted, UP_part)
|
| 1653 | self._EvalDoubleQuoted(part.parts, part_vals)
|
| 1654 |
|
| 1655 | elif case(word_part_e.CommandSub):
|
| 1656 | part = cast(CommandSub, UP_part)
|
| 1657 | id_ = part.left_token.id
|
| 1658 | if id_ in (Id.Left_DollarParen, Id.Left_AtParen,
|
| 1659 | Id.Left_Backtick):
|
| 1660 | sv = self._EvalCommandSub(part,
|
| 1661 | quoted) # type: part_value_t
|
| 1662 |
|
| 1663 | elif id_ in (Id.Left_ProcSubIn, Id.Left_ProcSubOut):
|
| 1664 | sv = self._EvalProcessSub(part)
|
| 1665 |
|
| 1666 | else:
|
| 1667 | raise AssertionError(id_)
|
| 1668 |
|
| 1669 | part_vals.append(sv)
|
| 1670 |
|
| 1671 | elif case(word_part_e.SimpleVarSub):
|
| 1672 | part = cast(SimpleVarSub, UP_part)
|
| 1673 | self._EvalSimpleVarSub(part, part_vals, quoted)
|
| 1674 |
|
| 1675 | elif case(word_part_e.BracedVarSub):
|
| 1676 | part = cast(BracedVarSub, UP_part)
|
| 1677 | self._EvalBracedVarSub(part, part_vals, quoted)
|
| 1678 |
|
| 1679 | elif case(word_part_e.TildeSub):
|
| 1680 | part = cast(word_part.TildeSub, UP_part)
|
| 1681 | # We never parse a quoted string into a TildeSub.
|
| 1682 | assert not quoted
|
| 1683 | s = self.tilde_ev.Eval(part)
|
| 1684 | v = Piece(s, True, False) # NOT split even when unquoted!
|
| 1685 | part_vals.append(v)
|
| 1686 |
|
| 1687 | elif case(word_part_e.ArithSub):
|
| 1688 | part = cast(word_part.ArithSub, UP_part)
|
| 1689 | num = self.arith_ev.EvalToBigInt(part.anode)
|
| 1690 | v = Piece(mops.ToStr(num), quoted, not quoted)
|
| 1691 | part_vals.append(v)
|
| 1692 |
|
| 1693 | elif case(word_part_e.ExtGlob):
|
| 1694 | part = cast(word_part.ExtGlob, UP_part)
|
| 1695 | #if not self.exec_opts.extglob():
|
| 1696 | # die() # disallow at runtime? Don't just decay
|
| 1697 |
|
| 1698 | # Create a node to hold the flattened tree. The caller decides whether
|
| 1699 | # to pass it to fnmatch() or replace it with '*' and pass it to glob().
|
| 1700 | part_vals2 = [] # type: List[part_value_t]
|
| 1701 | self._EvalExtGlob(part, part_vals2) # flattens tree
|
| 1702 | part_vals.append(part_value.ExtGlob(part_vals2))
|
| 1703 |
|
| 1704 | elif case(word_part_e.BashRegexGroup):
|
| 1705 | part = cast(word_part.BashRegexGroup, UP_part)
|
| 1706 |
|
| 1707 | part_vals.append(Piece('(', False, False)) # not quoted
|
| 1708 | if part.child:
|
| 1709 | self._EvalWordToParts(part.child, part_vals, 0)
|
| 1710 | part_vals.append(Piece(')', False, False))
|
| 1711 |
|
| 1712 | elif case(word_part_e.Splice):
|
| 1713 | part = cast(word_part.Splice, UP_part)
|
| 1714 | val = self.mem.GetValue(part.var_name)
|
| 1715 |
|
| 1716 | strs = self.expr_ev.SpliceValue(val, part)
|
| 1717 | part_vals.append(part_value.Array(strs))
|
| 1718 |
|
| 1719 | elif case(word_part_e.ExprSub):
|
| 1720 | part = cast(word_part.ExprSub, UP_part)
|
| 1721 | part_val = self.expr_ev.EvalExprSub(part)
|
| 1722 | part_vals.append(part_val)
|
| 1723 |
|
| 1724 | elif case(word_part_e.ZshVarSub):
|
| 1725 | part = cast(word_part.ZshVarSub, UP_part)
|
| 1726 | e_die("ZSH var subs are parsed, but can't be evaluated",
|
| 1727 | part.left)
|
| 1728 |
|
| 1729 | else:
|
| 1730 | raise AssertionError(part.tag())
|
| 1731 |
|
| 1732 | def _EvalRhsWordToParts(self, w, part_vals, eval_flags=0):
|
| 1733 | # type: (rhs_word_t, List[part_value_t], int) -> None
|
| 1734 | quoted = bool(eval_flags & QUOTED)
|
| 1735 |
|
| 1736 | UP_w = w
|
| 1737 | with tagswitch(w) as case:
|
| 1738 | if case(rhs_word_e.Empty):
|
| 1739 | part_vals.append(Piece('', quoted, not quoted))
|
| 1740 |
|
| 1741 | elif case(rhs_word_e.Compound):
|
| 1742 | w = cast(CompoundWord, UP_w)
|
| 1743 | self._EvalWordToParts(w, part_vals, eval_flags=eval_flags)
|
| 1744 |
|
| 1745 | else:
|
| 1746 | raise AssertionError()
|
| 1747 |
|
| 1748 | def _EvalWordToParts(self, w, part_vals, eval_flags=0):
|
| 1749 | # type: (CompoundWord, List[part_value_t], int) -> None
|
| 1750 | """Helper for EvalRhsWord, EvalWordSequence, etc.
|
| 1751 |
|
| 1752 | Returns:
|
| 1753 | Appends to part_vals. Note that this is a TREE.
|
| 1754 | """
|
| 1755 | # Does the word have an extended glob? This is a special case because
|
| 1756 | # of the way we use glob() and then fnmatch(..., FNM_EXTMATCH) to
|
| 1757 | # implement extended globs. It's hard to carry that extra information
|
| 1758 | # all the way past the word splitting stage.
|
| 1759 |
|
| 1760 | # OSH semantic limitations: If a word has an extended glob part, then
|
| 1761 | # 1. It can't have an array
|
| 1762 | # 2. Word splitting of unquoted words isn't respected
|
| 1763 |
|
| 1764 | word_part_vals = [] # type: List[part_value_t]
|
| 1765 | has_extglob = False
|
| 1766 | for p in w.parts:
|
| 1767 | if p.tag() == word_part_e.ExtGlob:
|
| 1768 | has_extglob = True
|
| 1769 | self._EvalWordPart(p, word_part_vals, eval_flags)
|
| 1770 |
|
| 1771 | # Caller REQUESTED extglob evaluation, AND we parsed word_part.ExtGlob()
|
| 1772 | if has_extglob:
|
| 1773 | if bool(eval_flags & EXTGLOB_FILES):
|
| 1774 | # Treat the WHOLE word as a pattern. We need to TWO VARIANTS of the
|
| 1775 | # word because of the way we use libc:
|
| 1776 | # 1. With '*' for extglob parts
|
| 1777 | # 2. With _EvalExtGlob() for extglob parts
|
| 1778 |
|
| 1779 | glob_parts = [] # type: List[str]
|
| 1780 | fnmatch_parts = [] # type: List[str]
|
| 1781 | self._TranslateExtGlob(word_part_vals, w, glob_parts,
|
| 1782 | fnmatch_parts)
|
| 1783 |
|
| 1784 | #log('word_part_vals %s', word_part_vals)
|
| 1785 | glob_pat = ''.join(glob_parts)
|
| 1786 | fnmatch_pat = ''.join(fnmatch_parts)
|
| 1787 | #log("glob %s fnmatch %s", glob_pat, fnmatch_pat)
|
| 1788 |
|
| 1789 | results = [] # type: List[str]
|
| 1790 | n = self.globber.ExpandExtended(glob_pat, fnmatch_pat, results)
|
| 1791 | if n < 0:
|
| 1792 | raise error.FailGlob(
|
| 1793 | 'Extended glob %r matched no files' % fnmatch_pat, w)
|
| 1794 |
|
| 1795 | part_vals.append(part_value.Array(results))
|
| 1796 | elif bool(eval_flags & EXTGLOB_NESTED):
|
| 1797 | # We only glob at the TOP level of @(nested|@(pattern))
|
| 1798 | part_vals.extend(word_part_vals)
|
| 1799 | else:
|
| 1800 | # e.g. simple_word_eval, assignment builtin
|
| 1801 | e_die('Extended glob not allowed in this word', w)
|
| 1802 | else:
|
| 1803 | part_vals.extend(word_part_vals)
|
| 1804 |
|
| 1805 | def _PartValsToString(self, part_vals, w, eval_flags, strs):
|
| 1806 | # type: (List[part_value_t], CompoundWord, int, List[str]) -> None
|
| 1807 | """Helper for EvalWordToString, similar to _ConcatPartVals() above.
|
| 1808 |
|
| 1809 | Note: arg 'w' could just be a span ID
|
| 1810 | """
|
| 1811 | for part_val in part_vals:
|
| 1812 | UP_part_val = part_val
|
| 1813 | with tagswitch(part_val) as case:
|
| 1814 | if case(part_value_e.String):
|
| 1815 | part_val = cast(Piece, UP_part_val)
|
| 1816 | s = part_val.s
|
| 1817 | if part_val.quoted:
|
| 1818 | if eval_flags & QUOTE_FNMATCH:
|
| 1819 | # [[ foo == */"*".py ]] or case (*.py) or ${x%*.py} or ${x//*.py/}
|
| 1820 | s = glob_.GlobEscape(s)
|
| 1821 | elif eval_flags & QUOTE_ERE:
|
| 1822 | s = glob_.ExtendedRegexEscape(s)
|
| 1823 | strs.append(s)
|
| 1824 |
|
| 1825 | elif case(part_value_e.Array):
|
| 1826 | part_val = cast(part_value.Array, UP_part_val)
|
| 1827 | if self.exec_opts.strict_array():
|
| 1828 | # Examples: echo f > "$@"; local foo="$@"
|
| 1829 |
|
| 1830 | # TODO: This attributes too coarsely, to the word rather than the
|
| 1831 | # parts. Problem: the word is a TREE of parts, but we only have a
|
| 1832 | # flat list of part_vals. The only case where we really get arrays
|
| 1833 | # is "$@", "${a[@]}", "${a[@]//pat/replace}", etc.
|
| 1834 | e_die(
|
| 1835 | "This word should yield a string, but it contains an array",
|
| 1836 | w)
|
| 1837 |
|
| 1838 | # TODO: Maybe add detail like this.
|
| 1839 | #e_die('RHS of assignment should only have strings. '
|
| 1840 | # 'To assign arrays, use b=( "${a[@]}" )')
|
| 1841 | else:
|
| 1842 | # It appears to not respect IFS
|
| 1843 | tmp = [s for s in part_val.strs if s is not None]
|
| 1844 | s = ' '.join(tmp) # TODO: eliminate double join()?
|
| 1845 | strs.append(s)
|
| 1846 |
|
| 1847 | elif case(part_value_e.ExtGlob):
|
| 1848 | part_val = cast(part_value.ExtGlob, UP_part_val)
|
| 1849 |
|
| 1850 | # Extended globs are only allowed where we expect them!
|
| 1851 | if not bool(eval_flags & QUOTE_FNMATCH):
|
| 1852 | e_die('extended glob not allowed in this word', w)
|
| 1853 |
|
| 1854 | # recursive call
|
| 1855 | self._PartValsToString(part_val.part_vals, w, eval_flags,
|
| 1856 | strs)
|
| 1857 |
|
| 1858 | else:
|
| 1859 | raise AssertionError()
|
| 1860 |
|
| 1861 | def EvalWordToString(self, UP_w, eval_flags=0):
|
| 1862 | # type: (word_t, int) -> value.Str
|
| 1863 | """Given a word, return a string.
|
| 1864 |
|
| 1865 | Flags can contain a quoting algorithm.
|
| 1866 | """
|
| 1867 | assert UP_w.tag() == word_e.Compound, UP_w
|
| 1868 | w = cast(CompoundWord, UP_w)
|
| 1869 |
|
| 1870 | if eval_flags == 0: # QUOTE_FNMATCH etc. breaks optimization
|
| 1871 | fast_str = word_.FastStrEval(w)
|
| 1872 | if fast_str is not None:
|
| 1873 | return value.Str(fast_str)
|
| 1874 |
|
| 1875 | # Could we additionally optimize a=$b, if we know $b isn't an array
|
| 1876 | # etc.?
|
| 1877 |
|
| 1878 | # Note: these empty lists are hot in fib benchmark
|
| 1879 |
|
| 1880 | part_vals = [] # type: List[part_value_t]
|
| 1881 | for p in w.parts:
|
| 1882 | # this doesn't use eval_flags, which is slightly confusing
|
| 1883 | self._EvalWordPart(p, part_vals, 0)
|
| 1884 |
|
| 1885 | strs = [] # type: List[str]
|
| 1886 | self._PartValsToString(part_vals, w, eval_flags, strs)
|
| 1887 | return value.Str(''.join(strs))
|
| 1888 |
|
| 1889 | def EvalWordToPattern(self, UP_w):
|
| 1890 | # type: (rhs_word_t) -> Tuple[value.Str, bool]
|
| 1891 | """Like EvalWordToString, but returns whether we got ExtGlob."""
|
| 1892 | if UP_w.tag() == rhs_word_e.Empty:
|
| 1893 | return value.Str(''), False
|
| 1894 |
|
| 1895 | assert UP_w.tag() == rhs_word_e.Compound, UP_w
|
| 1896 | w = cast(CompoundWord, UP_w)
|
| 1897 |
|
| 1898 | has_extglob = False
|
| 1899 | part_vals = [] # type: List[part_value_t]
|
| 1900 | for p in w.parts:
|
| 1901 | # this doesn't use eval_flags, which is slightly confusing
|
| 1902 | self._EvalWordPart(p, part_vals, 0)
|
| 1903 | if p.tag() == word_part_e.ExtGlob:
|
| 1904 | has_extglob = True
|
| 1905 |
|
| 1906 | strs = [] # type: List[str]
|
| 1907 | self._PartValsToString(part_vals, w, QUOTE_FNMATCH, strs)
|
| 1908 | return value.Str(''.join(strs)), has_extglob
|
| 1909 |
|
| 1910 | def EvalForPlugin(self, w):
|
| 1911 | # type: (CompoundWord) -> value.Str
|
| 1912 | """Wrapper around EvalWordToString that prevents errors.
|
| 1913 |
|
| 1914 | Runtime errors like $(( 1 / 0 )) and mutating $? like $(exit 42)
|
| 1915 | are handled here.
|
| 1916 |
|
| 1917 | Similar to ExprEvaluator.PluginCall().
|
| 1918 | """
|
| 1919 | with state.ctx_Registers(self.mem): # to "sandbox" $? and $PIPESTATUS
|
| 1920 | try:
|
| 1921 | val = self.EvalWordToString(w)
|
| 1922 | except error.FatalRuntime as e:
|
| 1923 | val = value.Str('<Runtime error: %s>' % e.UserErrorString())
|
| 1924 |
|
| 1925 | except (IOError, OSError) as e:
|
| 1926 | val = value.Str('<I/O error: %s>' % pyutil.strerror(e))
|
| 1927 |
|
| 1928 | except KeyboardInterrupt:
|
| 1929 | val = value.Str('<Ctrl-C>')
|
| 1930 |
|
| 1931 | return val
|
| 1932 |
|
| 1933 | def EvalRhsWord(self, UP_w):
|
| 1934 | # type: (rhs_word_t) -> value_t
|
| 1935 | """Used for RHS of assignment.
|
| 1936 |
|
| 1937 | There is no splitting.
|
| 1938 | """
|
| 1939 | if UP_w.tag() == rhs_word_e.Empty:
|
| 1940 | return value.Str('')
|
| 1941 |
|
| 1942 | assert UP_w.tag() == word_e.Compound, UP_w
|
| 1943 | w = cast(CompoundWord, UP_w)
|
| 1944 |
|
| 1945 | if len(w.parts) == 1:
|
| 1946 | part0 = w.parts[0]
|
| 1947 | UP_part0 = part0
|
| 1948 | tag = part0.tag()
|
| 1949 | # Special case for a=(1 2). ShArrayLiteral won't appear in words that
|
| 1950 | # don't look like assignments.
|
| 1951 | if tag == word_part_e.ShArrayLiteral:
|
| 1952 | part0 = cast(ShArrayLiteral, UP_part0)
|
| 1953 | array_words = part0.words
|
| 1954 | words = braces.BraceExpandWords(array_words)
|
| 1955 | strs = self.EvalWordSequence(words)
|
| 1956 | return value.BashArray(strs)
|
| 1957 |
|
| 1958 | if tag == word_part_e.BashAssocLiteral:
|
| 1959 | part0 = cast(word_part.BashAssocLiteral, UP_part0)
|
| 1960 | d = NewDict() # type: Dict[str, str]
|
| 1961 | for pair in part0.pairs:
|
| 1962 | k = self.EvalWordToString(pair.key)
|
| 1963 | v = self.EvalWordToString(pair.value)
|
| 1964 | d[k.s] = v.s
|
| 1965 | return value.BashAssoc(d)
|
| 1966 |
|
| 1967 | # If RHS doesn't look like a=( ... ), then it must be a string.
|
| 1968 | return self.EvalWordToString(w)
|
| 1969 |
|
| 1970 | def _EvalWordFrame(self, frame, argv):
|
| 1971 | # type: (List[Piece], List[str]) -> None
|
| 1972 | all_empty = True
|
| 1973 | all_quoted = True
|
| 1974 | any_quoted = False
|
| 1975 |
|
| 1976 | #log('--- frame %s', frame)
|
| 1977 |
|
| 1978 | for piece in frame:
|
| 1979 | if len(piece.s):
|
| 1980 | all_empty = False
|
| 1981 |
|
| 1982 | if piece.quoted:
|
| 1983 | any_quoted = True
|
| 1984 | else:
|
| 1985 | all_quoted = False
|
| 1986 |
|
| 1987 | # Elision of ${empty}${empty} but not $empty"$empty" or $empty""
|
| 1988 | if all_empty and not any_quoted:
|
| 1989 | return
|
| 1990 |
|
| 1991 | # If every frag is quoted, e.g. "$a$b" or any part in "${a[@]}"x, then
|
| 1992 | # don't do word splitting or globbing.
|
| 1993 | if all_quoted:
|
| 1994 | tmp = [piece.s for piece in frame]
|
| 1995 | a = ''.join(tmp)
|
| 1996 | argv.append(a)
|
| 1997 | return
|
| 1998 |
|
| 1999 | will_glob = not self.exec_opts.noglob()
|
| 2000 |
|
| 2001 | # Array of strings, some of which are BOTH IFS-escaped and GLOB escaped!
|
| 2002 | frags = [] # type: List[str]
|
| 2003 | for piece in frame:
|
| 2004 | if will_glob and piece.quoted:
|
| 2005 | frag = glob_.GlobEscape(piece.s)
|
| 2006 | else:
|
| 2007 | # If we have a literal \, then we turn it into \\\\.
|
| 2008 | # Splitting takes \\\\ -> \\
|
| 2009 | # Globbing takes \\ to \ if it doesn't match
|
| 2010 | frag = _BackslashEscape(piece.s)
|
| 2011 |
|
| 2012 | if piece.do_split:
|
| 2013 | frag = _BackslashEscape(frag)
|
| 2014 | else:
|
| 2015 | frag = self.splitter.Escape(frag)
|
| 2016 |
|
| 2017 | frags.append(frag)
|
| 2018 |
|
| 2019 | flat = ''.join(frags)
|
| 2020 | #log('flat: %r', flat)
|
| 2021 |
|
| 2022 | args = self.splitter.SplitForWordEval(flat)
|
| 2023 |
|
| 2024 | # space=' '; argv $space"". We have a quoted part, but we CANNOT elide.
|
| 2025 | # Add it back and don't bother globbing.
|
| 2026 | if len(args) == 0 and any_quoted:
|
| 2027 | argv.append('')
|
| 2028 | return
|
| 2029 |
|
| 2030 | #log('split args: %r', args)
|
| 2031 | for a in args:
|
| 2032 | if glob_.LooksLikeGlob(a):
|
| 2033 | n = self.globber.Expand(a, argv)
|
| 2034 | if n < 0:
|
| 2035 | # TODO: location info, with span IDs carried through the frame
|
| 2036 | raise error.FailGlob('Pattern %r matched no files' % a,
|
| 2037 | loc.Missing)
|
| 2038 | else:
|
| 2039 | argv.append(glob_.GlobUnescape(a))
|
| 2040 |
|
| 2041 | def _EvalWordToArgv(self, w):
|
| 2042 | # type: (CompoundWord) -> List[str]
|
| 2043 | """Helper for _EvalAssignBuiltin.
|
| 2044 |
|
| 2045 | Splitting and globbing are disabled for assignment builtins.
|
| 2046 |
|
| 2047 | Example: declare -"${a[@]}" b=(1 2)
|
| 2048 | where a is [x b=a d=a]
|
| 2049 | """
|
| 2050 | part_vals = [] # type: List[part_value_t]
|
| 2051 | self._EvalWordToParts(w, part_vals, 0) # not double quoted
|
| 2052 | frames = _MakeWordFrames(part_vals)
|
| 2053 | argv = [] # type: List[str]
|
| 2054 | for frame in frames:
|
| 2055 | if len(frame): # empty array gives empty frame!
|
| 2056 | tmp = [piece.s for piece in frame]
|
| 2057 | argv.append(''.join(tmp)) # no split or glob
|
| 2058 | #log('argv: %s', argv)
|
| 2059 | return argv
|
| 2060 |
|
| 2061 | def _EvalAssignBuiltin(self, builtin_id, arg0, words, meta_offset):
|
| 2062 | # type: (builtin_t, str, List[CompoundWord], int) -> cmd_value.Assign
|
| 2063 | """Handles both static and dynamic assignment, e.g.
|
| 2064 |
|
| 2065 | x='foo=bar'
|
| 2066 | local a=(1 2) $x
|
| 2067 |
|
| 2068 | Grammar:
|
| 2069 |
|
| 2070 | ('builtin' | 'command')* keyword flag* pair*
|
| 2071 | flag = [-+].*
|
| 2072 |
|
| 2073 | There is also command -p, but we haven't implemented it. Maybe just
|
| 2074 | punt on it.
|
| 2075 | """
|
| 2076 | eval_to_pairs = True # except for -f and -F
|
| 2077 | started_pairs = False
|
| 2078 |
|
| 2079 | flags = [arg0] # initial flags like -p, and -f -F name1 name2
|
| 2080 | flag_locs = [words[0]]
|
| 2081 | assign_args = [] # type: List[AssignArg]
|
| 2082 |
|
| 2083 | n = len(words)
|
| 2084 | for i in xrange(meta_offset + 1, n): # skip first word
|
| 2085 | w = words[i]
|
| 2086 |
|
| 2087 | if word_.IsVarLike(w):
|
| 2088 | started_pairs = True # Everything from now on is an assign_pair
|
| 2089 |
|
| 2090 | if started_pairs:
|
| 2091 | left_token, close_token, part_offset = word_.DetectShAssignment(
|
| 2092 | w)
|
| 2093 | if left_token: # Detected statically
|
| 2094 | if left_token.id != Id.Lit_VarLike:
|
| 2095 | # (not guaranteed since started_pairs is set twice)
|
| 2096 | e_die('LHS array not allowed in assignment builtin', w)
|
| 2097 |
|
| 2098 | if lexer.IsPlusEquals(left_token):
|
| 2099 | var_name = lexer.TokenSliceRight(left_token, -2)
|
| 2100 | append = True
|
| 2101 | else:
|
| 2102 | var_name = lexer.TokenSliceRight(left_token, -1)
|
| 2103 | append = False
|
| 2104 |
|
| 2105 | if part_offset == len(w.parts):
|
| 2106 | rhs = rhs_word.Empty # type: rhs_word_t
|
| 2107 | else:
|
| 2108 | # tmp is for intersection of C++/MyPy type systems
|
| 2109 | tmp = CompoundWord(w.parts[part_offset:])
|
| 2110 | word_.TildeDetectAssign(tmp)
|
| 2111 | rhs = tmp
|
| 2112 |
|
| 2113 | with state.ctx_AssignBuiltin(self.mutable_opts):
|
| 2114 | right = self.EvalRhsWord(rhs)
|
| 2115 |
|
| 2116 | arg2 = AssignArg(var_name, right, append, w)
|
| 2117 | assign_args.append(arg2)
|
| 2118 |
|
| 2119 | else: # e.g. export $dynamic
|
| 2120 | argv = self._EvalWordToArgv(w)
|
| 2121 | for arg in argv:
|
| 2122 | arg2 = _SplitAssignArg(arg, w)
|
| 2123 | assign_args.append(arg2)
|
| 2124 |
|
| 2125 | else:
|
| 2126 | argv = self._EvalWordToArgv(w)
|
| 2127 | for arg in argv:
|
| 2128 | if arg.startswith('-') or arg.startswith('+'):
|
| 2129 | # e.g. declare -r +r
|
| 2130 | flags.append(arg)
|
| 2131 | flag_locs.append(w)
|
| 2132 |
|
| 2133 | # Shortcut that relies on -f and -F always meaning "function" for
|
| 2134 | # all assignment builtins
|
| 2135 | if 'f' in arg or 'F' in arg:
|
| 2136 | eval_to_pairs = False
|
| 2137 |
|
| 2138 | else: # e.g. export $dynamic
|
| 2139 | if eval_to_pairs:
|
| 2140 | arg2 = _SplitAssignArg(arg, w)
|
| 2141 | assign_args.append(arg2)
|
| 2142 | started_pairs = True
|
| 2143 | else:
|
| 2144 | flags.append(arg)
|
| 2145 |
|
| 2146 | return cmd_value.Assign(builtin_id, flags, flag_locs, assign_args)
|
| 2147 |
|
| 2148 | def _DetectAssignBuiltinStr(self, arg0, words, meta_offset):
|
| 2149 | # type: (str, List[CompoundWord], int) -> Optional[cmd_value.Assign]
|
| 2150 | builtin_id = consts.LookupAssignBuiltin(arg0)
|
| 2151 | if builtin_id != consts.NO_INDEX:
|
| 2152 | return self._EvalAssignBuiltin(builtin_id, arg0, words,
|
| 2153 | meta_offset)
|
| 2154 | return None
|
| 2155 |
|
| 2156 | def _DetectAssignBuiltin(self, val0, words, meta_offset):
|
| 2157 | # type: (part_value_t, List[CompoundWord], int) -> Optional[cmd_value.Assign]
|
| 2158 | UP_val0 = val0
|
| 2159 | if val0.tag() == part_value_e.String:
|
| 2160 | val0 = cast(Piece, UP_val0)
|
| 2161 | if not val0.quoted:
|
| 2162 | return self._DetectAssignBuiltinStr(val0.s, words, meta_offset)
|
| 2163 | return None
|
| 2164 |
|
| 2165 | def SimpleEvalWordSequence2(self, words, is_last_cmd, allow_assign):
|
| 2166 | # type: (List[CompoundWord], bool, bool) -> cmd_value_t
|
| 2167 | """Simple word evaluation for YSH."""
|
| 2168 | strs = [] # type: List[str]
|
| 2169 | locs = [] # type: List[CompoundWord]
|
| 2170 |
|
| 2171 | meta_offset = 0
|
| 2172 | for i, w in enumerate(words):
|
| 2173 | # No globbing in the first arg for command.Simple.
|
| 2174 | if i == meta_offset and allow_assign:
|
| 2175 | strs0 = self._EvalWordToArgv(w)
|
| 2176 | # TODO: Remove this because YSH will disallow assignment
|
| 2177 | # builtins? (including export?)
|
| 2178 | if len(strs0) == 1:
|
| 2179 | cmd_val = self._DetectAssignBuiltinStr(
|
| 2180 | strs0[0], words, meta_offset)
|
| 2181 | if cmd_val:
|
| 2182 | return cmd_val
|
| 2183 |
|
| 2184 | strs.extend(strs0)
|
| 2185 | for _ in strs0:
|
| 2186 | locs.append(w)
|
| 2187 | continue
|
| 2188 |
|
| 2189 | if glob_.LooksLikeStaticGlob(w):
|
| 2190 | val = self.EvalWordToString(w) # respects strict-array
|
| 2191 | num_appended = self.globber.Expand(val.s, strs)
|
| 2192 | if num_appended < 0:
|
| 2193 | raise error.FailGlob('Pattern %r matched no files' % val.s,
|
| 2194 | w)
|
| 2195 | for _ in xrange(num_appended):
|
| 2196 | locs.append(w)
|
| 2197 | continue
|
| 2198 |
|
| 2199 | part_vals = [] # type: List[part_value_t]
|
| 2200 | self._EvalWordToParts(w, part_vals, 0) # not quoted
|
| 2201 |
|
| 2202 | if 0:
|
| 2203 | log('')
|
| 2204 | log('Static: part_vals after _EvalWordToParts:')
|
| 2205 | for entry in part_vals:
|
| 2206 | log(' %s', entry)
|
| 2207 |
|
| 2208 | # Still need to process
|
| 2209 | frames = _MakeWordFrames(part_vals)
|
| 2210 |
|
| 2211 | if 0:
|
| 2212 | log('')
|
| 2213 | log('Static: frames after _MakeWordFrames:')
|
| 2214 | for entry in frames:
|
| 2215 | log(' %s', entry)
|
| 2216 |
|
| 2217 | # We will still allow x"${a[@]"x, though it's deprecated by @a, which
|
| 2218 | # disallows such expressions at parse time.
|
| 2219 | for frame in frames:
|
| 2220 | if len(frame): # empty array gives empty frame!
|
| 2221 | tmp = [piece.s for piece in frame]
|
| 2222 | strs.append(''.join(tmp)) # no split or glob
|
| 2223 | locs.append(w)
|
| 2224 |
|
| 2225 | return cmd_value.Argv(strs, locs, is_last_cmd, None, None)
|
| 2226 |
|
| 2227 | def EvalWordSequence2(self, words, is_last_cmd, allow_assign=False):
|
| 2228 | # type: (List[CompoundWord], bool, bool) -> cmd_value_t
|
| 2229 | """Turns a list of Words into a list of strings.
|
| 2230 |
|
| 2231 | Unlike the EvalWord*() methods, it does globbing.
|
| 2232 |
|
| 2233 | Args:
|
| 2234 | allow_assign: True for command.Simple, False for BashArray a=(1 2 3)
|
| 2235 | """
|
| 2236 | if self.exec_opts.simple_word_eval():
|
| 2237 | return self.SimpleEvalWordSequence2(words, is_last_cmd,
|
| 2238 | allow_assign)
|
| 2239 |
|
| 2240 | # Parse time:
|
| 2241 | # 1. brace expansion. TODO: Do at parse time.
|
| 2242 | # 2. Tilde detection. DONE at parse time. Only if Id.Lit_Tilde is the
|
| 2243 | # first WordPart.
|
| 2244 | #
|
| 2245 | # Run time:
|
| 2246 | # 3. tilde sub, var sub, command sub, arith sub. These are all
|
| 2247 | # "concurrent" on WordParts. (optional process sub with <() )
|
| 2248 | # 4. word splitting. Can turn this off with a shell option? Definitely
|
| 2249 | # off for oil.
|
| 2250 | # 5. globbing -- several exec_opts affect this: nullglob, safeglob, etc.
|
| 2251 |
|
| 2252 | #log('W %s', words)
|
| 2253 | strs = [] # type: List[str]
|
| 2254 | locs = [] # type: List[CompoundWord]
|
| 2255 |
|
| 2256 | # 0 for declare x
|
| 2257 | # 1 for builtin declare x
|
| 2258 | # 2 for command builtin declare x
|
| 2259 | # etc.
|
| 2260 | meta_offset = 0
|
| 2261 |
|
| 2262 | n = 0
|
| 2263 | for i, w in enumerate(words):
|
| 2264 | fast_str = word_.FastStrEval(w)
|
| 2265 | if fast_str is not None:
|
| 2266 | strs.append(fast_str)
|
| 2267 | locs.append(w)
|
| 2268 |
|
| 2269 | # e.g. the 'local' in 'local a=b c=d' will be here
|
| 2270 | if allow_assign and i == meta_offset:
|
| 2271 | cmd_val = self._DetectAssignBuiltinStr(
|
| 2272 | fast_str, words, meta_offset)
|
| 2273 | if cmd_val:
|
| 2274 | return cmd_val
|
| 2275 |
|
| 2276 | if i <= meta_offset and _DetectMetaBuiltinStr(fast_str):
|
| 2277 | meta_offset += 1
|
| 2278 |
|
| 2279 | continue
|
| 2280 |
|
| 2281 | part_vals = [] # type: List[part_value_t]
|
| 2282 | self._EvalWordToParts(w, part_vals, EXTGLOB_FILES)
|
| 2283 |
|
| 2284 | # DYNAMICALLY detect if we're going to run an assignment builtin, and
|
| 2285 | # change the rest of the evaluation algorithm if so.
|
| 2286 | #
|
| 2287 | # We want to allow:
|
| 2288 | # e=export
|
| 2289 | # $e foo=bar
|
| 2290 | #
|
| 2291 | # But we don't want to evaluate the first word twice in the case of:
|
| 2292 | # $(some-command) --flag
|
| 2293 | if len(part_vals) == 1:
|
| 2294 | if allow_assign and i == meta_offset:
|
| 2295 | cmd_val = self._DetectAssignBuiltin(
|
| 2296 | part_vals[0], words, meta_offset)
|
| 2297 | if cmd_val:
|
| 2298 | return cmd_val
|
| 2299 |
|
| 2300 | if i <= meta_offset and _DetectMetaBuiltin(part_vals[0]):
|
| 2301 | meta_offset += 1
|
| 2302 |
|
| 2303 | if 0:
|
| 2304 | log('')
|
| 2305 | log('part_vals after _EvalWordToParts:')
|
| 2306 | for entry in part_vals:
|
| 2307 | log(' %s', entry)
|
| 2308 |
|
| 2309 | frames = _MakeWordFrames(part_vals)
|
| 2310 | if 0:
|
| 2311 | log('')
|
| 2312 | log('frames after _MakeWordFrames:')
|
| 2313 | for entry in frames:
|
| 2314 | log(' %s', entry)
|
| 2315 |
|
| 2316 | # Do splitting and globbing. Each frame will append zero or more args.
|
| 2317 | for frame in frames:
|
| 2318 | self._EvalWordFrame(frame, strs)
|
| 2319 |
|
| 2320 | # Fill in locations parallel to strs.
|
| 2321 | n_next = len(strs)
|
| 2322 | for _ in xrange(n_next - n):
|
| 2323 | locs.append(w)
|
| 2324 | n = n_next
|
| 2325 |
|
| 2326 | # A non-assignment command.
|
| 2327 | # NOTE: Can't look up builtins here like we did for assignment, because
|
| 2328 | # functions can override builtins.
|
| 2329 | return cmd_value.Argv(strs, locs, is_last_cmd, None, None)
|
| 2330 |
|
| 2331 | def EvalWordSequence(self, words):
|
| 2332 | # type: (List[CompoundWord]) -> List[str]
|
| 2333 | """For arrays and for loops.
|
| 2334 |
|
| 2335 | They don't allow assignment builtins.
|
| 2336 | """
|
| 2337 | # is_last_cmd is irrelevant
|
| 2338 | cmd_val = self.EvalWordSequence2(words, False)
|
| 2339 | assert cmd_val.tag() == cmd_value_e.Argv
|
| 2340 | return cast(cmd_value.Argv, cmd_val).argv
|
| 2341 |
|
| 2342 |
|
| 2343 | class NormalWordEvaluator(AbstractWordEvaluator):
|
| 2344 |
|
| 2345 | def __init__(
|
| 2346 | self,
|
| 2347 | mem, # type: state.Mem
|
| 2348 | exec_opts, # type: optview.Exec
|
| 2349 | mutable_opts, # type: state.MutableOpts
|
| 2350 | tilde_ev, # type: TildeEvaluator
|
| 2351 | splitter, # type: SplitContext
|
| 2352 | errfmt, # type: ui.ErrorFormatter
|
| 2353 | ):
|
| 2354 | # type: (...) -> None
|
| 2355 | AbstractWordEvaluator.__init__(self, mem, exec_opts, mutable_opts,
|
| 2356 | tilde_ev, splitter, errfmt)
|
| 2357 | self.shell_ex = None # type: _Executor
|
| 2358 |
|
| 2359 | def CheckCircularDeps(self):
|
| 2360 | # type: () -> None
|
| 2361 | assert self.arith_ev is not None
|
| 2362 | # Disabled for pure OSH
|
| 2363 | #assert self.expr_ev is not None
|
| 2364 | assert self.shell_ex is not None
|
| 2365 | assert self.prompt_ev is not None
|
| 2366 |
|
| 2367 | def _EvalCommandSub(self, cs_part, quoted):
|
| 2368 | # type: (CommandSub, bool) -> part_value_t
|
| 2369 | stdout_str = self.shell_ex.RunCommandSub(cs_part)
|
| 2370 |
|
| 2371 | if cs_part.left_token.id == Id.Left_AtParen:
|
| 2372 | # YSH splitting algorithm: does not depend on IFS
|
| 2373 | try:
|
| 2374 | strs = j8.SplitJ8Lines(stdout_str)
|
| 2375 | except error.Decode as e:
|
| 2376 | # status code 4 is special, for encode/decode errors.
|
| 2377 | raise error.Structured(4, e.Message(), cs_part.left_token)
|
| 2378 |
|
| 2379 | #strs = self.splitter.SplitForWordEval(stdout_str)
|
| 2380 | return part_value.Array(strs)
|
| 2381 | else:
|
| 2382 | return Piece(stdout_str, quoted, not quoted)
|
| 2383 |
|
| 2384 | def _EvalProcessSub(self, cs_part):
|
| 2385 | # type: (CommandSub) -> Piece
|
| 2386 | dev_path = self.shell_ex.RunProcessSub(cs_part)
|
| 2387 | # pretend it's quoted; no split or glob
|
| 2388 | return Piece(dev_path, True, False)
|
| 2389 |
|
| 2390 |
|
| 2391 | _DUMMY = '__NO_COMMAND_SUB__'
|
| 2392 |
|
| 2393 |
|
| 2394 | class CompletionWordEvaluator(AbstractWordEvaluator):
|
| 2395 | """An evaluator that has no access to an executor.
|
| 2396 |
|
| 2397 | NOTE: core/completion.py doesn't actually try to use these strings to
|
| 2398 | complete. If you have something like 'echo $(echo hi)/f<TAB>', it sees the
|
| 2399 | inner command as the last one, and knows that it is not at the end of the
|
| 2400 | line.
|
| 2401 | """
|
| 2402 |
|
| 2403 | def __init__(
|
| 2404 | self,
|
| 2405 | mem, # type: state.Mem
|
| 2406 | exec_opts, # type: optview.Exec
|
| 2407 | mutable_opts, # type: state.MutableOpts
|
| 2408 | tilde_ev, # type: TildeEvaluator
|
| 2409 | splitter, # type: SplitContext
|
| 2410 | errfmt, # type: ui.ErrorFormatter
|
| 2411 | ):
|
| 2412 | # type: (...) -> None
|
| 2413 | AbstractWordEvaluator.__init__(self, mem, exec_opts, mutable_opts,
|
| 2414 | tilde_ev, splitter, errfmt)
|
| 2415 |
|
| 2416 | def CheckCircularDeps(self):
|
| 2417 | # type: () -> None
|
| 2418 | assert self.prompt_ev is not None
|
| 2419 | assert self.arith_ev is not None
|
| 2420 | assert self.expr_ev is not None
|
| 2421 |
|
| 2422 | def _EvalCommandSub(self, cs_part, quoted):
|
| 2423 | # type: (CommandSub, bool) -> part_value_t
|
| 2424 | if cs_part.left_token.id == Id.Left_AtParen:
|
| 2425 | return part_value.Array([_DUMMY])
|
| 2426 | else:
|
| 2427 | return Piece(_DUMMY, quoted, not quoted)
|
| 2428 |
|
| 2429 | def _EvalProcessSub(self, cs_part):
|
| 2430 | # type: (CommandSub) -> Piece
|
| 2431 | # pretend it's quoted; no split or glob
|
| 2432 | return Piece('__NO_PROCESS_SUB__', True, False)
|
| 2433 |
|
| 2434 |
|
| 2435 | # vim: sw=4
|